wmaker: src/dialog cosmetic code change

This patch is just renaming the variable used for the info panel
from 'thePanel' to 'infoPanel'.
wmaker: fix application/dock icon balloon

This patch is fixing an issue introduced with apercu feature.
The balloon was not displayed if the type is appicon or dock icon.
WPrefs: fix key capture

This patch is used to fix the Debian bug #140181

It updates the NumLockMask function to report the mask and
call XFreeModifiermap when needed.
It also modifies capture_shortcut function to be able to use Super keys
and report numeric keypad when pressed (aka now detects correctly
if the numlock is enabled or not).