Prevent clobbering of activity options bundle when merging

- RemoteViews specify an ActivityOptions when calling startIntentSender()
  (for click handling), but if the PendingIntent being started also has an
  ActivityOptions, the merging of the two options will fail since the
  ActivityOptions properties are always written into the bundle (regardless
  of whether they are actually set).  Instead, only write non-default
  values to the bundle (the defaults will be read out if not set when
  restoring the options from the bundle anyways).

Bug: 72459081
Test: atest FrameworksServicesTests:ActivityOptionsTest

change-id: i1d6718d9db4b3f7056412c5b4c5347a19ffa7c09