Resolves: #i42309# change behavior for equal button of input line...

according to the current content of the cell

(cherry picked from commit ff1d1ea1f5f15ce7888957d09f4783d8055c7654)

Conflicts:
	sc/source/ui/app/inputwin.cxx

Change-Id: I054aa55de14e2dec5a9ace1124d7eb6aa261162f