Reorder if statements in Unequal's interpret_move() so that presses

Reorder if statements in Unequal's interpret_move() so that presses
of 'h' and 'm' are treated as digits if a square is selected, and
only treated as special commands otherwise. This renders very large
games (just about) playable.

Idea from Ben Hutchings's collection of Debian patches, although I
had to redo his (trivial) patch myself since the code has changed
recently.

(Addendum after committing: hmm, I see Jacob already applied the
original version of the patch a while back. Looks as if the recent
keyboard control change reintroduced the problem. Still, re-fixed
now.)

[originally from svn r8433]