stand: Remove Spleen 32x64 fonts from INDEX

The Spleen 32x64 fonts cause some systems such as the AMD Framework 16
to boot extremely slowly.  Adding screen.font="16x32" to
/boot/loader.conf is a partial workaround, but text displayed before the
boot menu still takes ~30 seconds to render on that laptop.  With this
change, the same text renders immediately.

By leaving the font files in place but removing them from the INDEX,
users who want to use them can still load them manually.  Once pending
work is committed to allow normal booting with these fonts, they can be
added back to the INDEX.

PR:		289007
Reviewed by:	emaste, kevans, tsoome, ziaee
Fixes:		1ec2c8b (stand: Enable Spleen 32x64 font in the bootloader)
Sponsored by:	The FreeBSD Foundation

Author: Jehops

stand/fonts/INDEX.fonts

@@ -60,9 +60,6 @@ FONT:en:8x16v.fnt
 16x32.fnt:en:Terminus BSD Console, size 32
 16x32.fnt:da:Terminus BSD-konsol, størrelse 32
 16x32.fnt:de:Terminus BSD Console, Größe 32
-32x64.fnt:en:Spleen BSD Console, size 64
-32x64.fnt:da:Spleen BSD-konsol, størrelse 64
-32x64.fnt:de:Spleen BSD Console, Größe 64
 
 # (fset 'langnew
 #   "\M-}\C-p\C-k\C-y\C-m\C-y\M-}")