MaskUsedModifiers: remove bits used for XKB group index #901
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According to section Xkb State to Core Protocol State Transformation, the Xkb-aware server reports group index in bits 13 and 14 of
XEvent.xkey.state
orXEvent.xbutton.state
. This interferes with FVWM's modifier handling, so remove these bits in functionMaskUsedModifiers
.Fixes #861