[PATCH] Keyboard modifers fix

Hi,

While wondering why the reload button on the toolbar didn't press in
properly, I realised that in a couple of places galeon was comparing the
modifier (shift and alt) against the keyval types (GDK_Shift_R etc) when
it should be using the GDK_SHIFT_MASK types.

This fixes the reload button to perform a normal reload when clicked and
do a full reload when doing shift+reload.

Also it fixes the code that allows ALT+num to jump between tabs.

Cheers

Crispin