Tweak the order keystrokes are sorted in keymap listings

* src/keymap.c (describe_map_compare): Change the sorting order of
keystrokes, so that we get the order <f1> <f2> <f11> instead of
<f1> <f11> <f2> (bug#33237).
1 job for master in 80 minutes and 7 seconds (queued for 4 seconds)
Status Job ID Name Coverage
  Test
passed #2495
test-all

01:20:07