font: s/10/11 in ascent for unicode.7x13.font

The subfont files were fixed in  https://plan9port-review.googlesource.com/#/c/1351/
but the font file was not.

Change-Id: I71ec13af9163f1b97b2fd499ff170a59c27ea7ec
Reviewed-on: https://plan9port-review.googlesource.com/1490
Reviewed-by: Nigel Tao <nigeltao@golang.org>
Reviewed-by: Russ Cox <rsc@google.com>

font/fixed/unicode.7x13.font

diff --git a/font/fixed/unicode.7x13.font b/font/fixed/unicode.7x13.font
index 337b428..f1dc0e5 100644
--- a/font/fixed/unicode.7x13.font
+++ b/font/fixed/unicode.7x13.font
@@ -1,4 +1,4 @@
-13 10
+13 11
 0x0000 0x001F 7x13.2400
 0x0000 0x00FF 7x13.0000
 0x0100 0x01FF 7x13.0100