WPrefs: Remove trimstr() and use wtrimspace() from WINGs
There's no need to have a private function while there's one in WINGs.
Besides that, it does not remove trailing whitespaces appropriately as I
just tested by adding trailing space in the shortcut captured by WPrefs.
It is not trimmed before saving it:
[mafra@Pilar:Defaults]$ grep CloseKey WindowMaker
CloseKey = "Mod1+C ";
Using wtrimspace() fixes that and even saves 208 bytes of code:
[mafra@Pilar:WPrefs.app]$ size KeyboardShortcuts.o.*
text data bss dec hex filename
7703 0 0 7703 1e17 KeyboardShortcuts.o.new
7911 0 0 7911 1ee7 KeyboardShortcuts.o.old
Signed-off-by: Carlos R. Mafra <crmafra@gmail.com>