Tests: Skip nonce tests in old iOS/Android as well
Tests: Skip nonce tests in old iOS/Android as well

Old iOS & Android Browser versions support script-src but not nonce, making the
nonce test impossible to run. Browsers not supporting CSP at all are not
a problem as they'll skip script-src restrictions completely.

Ref gh-3541
Ref gh-4269
Ref c7c2855ed13f23322c4064407c1ed84561b95738

jquery/jquery,jquery/jquery,jquery/jquery,roytoo/jquery,roytoo/jquery,roytoo/jquery