fix for 'Playback not found: touch_done_ios7_iphone.base64' when testing on iOS 5 + 6 and 'OS=ios7'

NOT TESTED ON IPAD - sorry, i just don't have time to do that testing. 

this does _not_ fix playback on iOS 7.  

the original code checked to see if an iOS 5 recording was available there was no recording for iOS 6.

updated to do the same for iOS 7 - try to load iOS 6, then iOS 5 recording.