Comment 2 for bug 484306

Proposing for stable release update

Impact of bug: Trailing zeroes can be displayed but not able to be disabled (unless user changes back to scientific or programming mode)
Solution: Code change to disable trailing zero option when not in scientific mode
Risk: Low, changes only effect this option

TEST CASE:
1. Open gcalctool
2. Check "show trailing zeroes" menu option is only sensitive in scientific mode
3. Change to scientific mode and enable show trailing zeroes
4. Change to other mode and confirm trailing zeroes are not shown (repeat for all other modes)

(note this change is the same as in bug 483730)