updated Toolbar.yml (#10016)
updated Toolbar.yml (#10016)

Removed the extra 'platform' property from extendBackground. They both had the same values, so I removed the latter one, tested locally, and confirmed the fix.

This is a fix for https://jira.appcelerator.org/browse/TIDOC-3177
mano-mykingdom/titanium_mobile,mano-mykingdom/titanium_mobile,mano-mykingdom/titanium_mobile,mano-mykingdom/titanium_mobile,mano-mykingdom/titanium_mobile,mano-mykingdom/titanium_mobile,mano-mykingdom/titanium_mobile,mano-mykingdom/titanium_mobile