MenuEntry: normalize the accelerator string
MenuEntry: normalize the accelerator string

... so that we can compare easily later on.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

This used to be revision r4191.

TehSAUCE/imagej,TehSAUCE/imagej,biovoxxel/imagej,biovoxxel/imagej,biovoxxel/imagej,TehSAUCE/imagej