Refactoring layout tests for AudioContext.suspend() and resume()

LayoutTests/webaudio/audiocontext-suspend-resume-expected.txt

 Test suspend/resume for an (offline) AudioContext
 
 On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
 
 
 PASS context.state is "suspended"
 PASS p1 = context.suspend() did not throw exception.
 PASS [object Object] is an instance of function Promise() { [native code] }
 PASS context.suspend() was correctly rejected for an offline context
-PASS p1 = context.resume() did not throw exception.
+PASS p2 = context.resume() did not throw exception.
 PASS [object Object] is an instance of function Promise() { [native code] }
 PASS context.state is "suspended"
 PASS context.resume() was correctly rejected for an offline context
 PASS context.state is "closed"
 PASS context.suspend() on a closed context rejected as expected
 PASS context.resume() on a closed context rejected as expected
 PASS successfullyParsed is true
 
 TEST COMPLETE