Drop openoffice.org 1.x related hack for windowType detection

The oo.o related hack can be removed for several reasons:
1. The dialog in question from bug 66065 is nowadays a utility
2. The window class name changed to libreoffice
3. It's not the task of the window manager to workaround bugs in Clients

CCBUG: 66065
BUG: 306383
FIXED-IN: 4.9.2