[image_picker_android] - fix crash handle choose multi image result

[Mairramer]

This will fix flutter/flutter#147280 and complements the PR #6691

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[gmackall]

We've actually been meaning to change up the way we get the paths that end up being returned from the Intent, which I've just landed in #5009. Sorry for the conflict, but that PR also fixes the linked issue, so I'm going to close this.

I appreciate you taking the time to land the first fix and put up this fix as well, though!