[REFACTOR] WhiteboardEditor: Remove commented-out stuff

Adapted from SWTP-2013 repository.
 - Commit: a46aa76
 - Reviewed on: http://saros-build.imp.fu-berlin.de/gerrit/999
 - Reviewed-by: Richard Möhn <richard.moehn@fu-berlin.de>

Change-Id: I4044ef3ed92478cb426f02abcd4b71dc9f11e6f9
Reviewed-on: http://saros-build.imp.fu-berlin.de/gerrit/1666
Tested-by: Jenkins CI
Reviewed-by: Stefan Rossbach <srossbach@arcor.de>