[TIMOB-15939] iOS7: OptionDialog scroll causes ghosting on iPAD

Fixes [TIMOB-15939](https://jira.appcelerator.org/browse/TIMOB-15939)

Test case is in [comments](https://jira.appcelerator.org/browse/TIMOB-15939?focusedCommentId=283561&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-283561)