TV: Change keycode in unhandled event test Change the keycode used in testOnUnhandledInputEventListener from KEYCODE_BUTTON_16 to KEYCODE_0 as the previous keycode seems to be handled now. Bug: 234333896 Bug: 333334664 Test: atest android.media.tv.cts.TvViewTest#testOnUnhandledInputEventListener Change-Id: Idb4141b50e0e3d3d360dbdd7d4b7766529f2add9