Multiple selection ability - wrong iOS detection

There is a bug in iOS 7.0.x and even on iOS 7.1.x , that results in inability to upload a video when `multiple_selection` in Plupload is set to `true`. All works fine in iOS 6.x and below.

The current check was considering all iOS versions smaller than 7.0.4 as broken. I've made a change to make all iOS 7.x versions as broken instead.

P.S.
Before this fix it's impossible to upload a video on iOS 7.0.6 and iOS 7.1.2 on iPhone 5S.