font/fixed: adjust the ascent for the 7x13 subfonts

The ascent in these subfonts was 10 pixels but the images
are using an 11 ascent, so fix all the ascents in the files.
This is the global ascent, not for each character. This change
makes them consistent with the usage in, for instance,
the lucsans directory.

Problem was found with some new Go code to handle these
fonts, and we'd like to publish the updated files so the Go
code can use them in a test. If preferable, of course, they could
be put under some other name.

Others may also want adjustment, but we can start here.

Change-Id: I6c518604eed5b35db641dc537e4b5a2810ad1cf9
Reviewed-on: https://plan9port-review.googlesource.com/1351
Reviewed-by: Nigel Tao <nigeltao@golang.org>
Reviewed-by: Russ Cox <rsc@swtch.com>
diff --git a/font/fixed/7x13.0000 b/font/fixed/7x13.0000
index e7713e1..9509cdf 100644
--- a/font/fixed/7x13.0000
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diff --git a/font/fixed/7x13.0100 b/font/fixed/7x13.0100
index d04e955..0a79f55 100644
--- a/font/fixed/7x13.0100
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diff --git a/font/fixed/7x13.0200 b/font/fixed/7x13.0200
index 186788c..e25247e 100644
--- a/font/fixed/7x13.0200
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diff --git a/font/fixed/7x13.0300 b/font/fixed/7x13.0300
index d93a58c..86eb33f 100644
--- a/font/fixed/7x13.0300
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diff --git a/font/fixed/7x13.0400 b/font/fixed/7x13.0400
index 6498994..43300ad 100644
--- a/font/fixed/7x13.0400
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diff --git a/font/fixed/7x13.0500 b/font/fixed/7x13.0500
index 2a8801d..2d93267 100644
--- a/font/fixed/7x13.0500
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diff --git a/font/fixed/7x13.0E00 b/font/fixed/7x13.0E00
index 2f66868..7c51a1e 100644
--- a/font/fixed/7x13.0E00
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diff --git a/font/fixed/7x13.1000 b/font/fixed/7x13.1000
index 372da08..019698c 100644
--- a/font/fixed/7x13.1000
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diff --git a/font/fixed/7x13.1600 b/font/fixed/7x13.1600
index 2414f1f..f69a977 100644
--- a/font/fixed/7x13.1600
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diff --git a/font/fixed/7x13.1E00 b/font/fixed/7x13.1E00
index f5ca4af..3bc5068 100644
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diff --git a/font/fixed/7x13.2000 b/font/fixed/7x13.2000
index 523d7e6..f9244e1 100644
--- a/font/fixed/7x13.2000
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diff --git a/font/fixed/7x13.2100 b/font/fixed/7x13.2100
index b93b6d7..c565abb 100644
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diff --git a/font/fixed/7x13.2200 b/font/fixed/7x13.2200
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diff --git a/font/fixed/7x13.2300 b/font/fixed/7x13.2300
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diff --git a/font/fixed/7x13.2400 b/font/fixed/7x13.2400
index 5053402..99927a1 100644
--- a/font/fixed/7x13.2400
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diff --git a/font/fixed/7x13.2500 b/font/fixed/7x13.2500
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diff --git a/font/fixed/7x13.2600 b/font/fixed/7x13.2600
index e236787..1b393c2 100644
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diff --git a/font/fixed/7x13.2700 b/font/fixed/7x13.2700
index a793f28..c39a572 100644
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diff --git a/font/fixed/7x13.2800 b/font/fixed/7x13.2800
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diff --git a/font/fixed/7x13.2A00 b/font/fixed/7x13.2A00
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