[TIMOB-16490] (3_2_X) iOS: barImage regression on iOS7

Cherry Pick of PR #5365

Fixes 
[TIMOB-16490](https://jira.appcelerator.org/browse/TIMOB-16490)

Regress against 
[TIMOB-16338](https://jira.appcelerator.org/browse/TIMOB-16338)