Fix an out-of-bounds access in MyEnhancedXkbTranslateKeyCode

Fix an out-of-bounds access in MyEnhancedXkbTranslateKeyCode

Commits 314b6abbe8d8daae and eb9223c008ccf1c2faab were ignoring
the fact that the code where found is set to 1 was modifying
col - which was an ok thing to do when that part of the code
was still breaking out of the loop, but it is no longer doing
that (since 2003 !). Fix things up by storing the final col
value in a separate variable and using that after the loop.

https://bugzilla.gnome.org/show_bug.cgi?id=738886