[LoadedApk] Use full class name for BroadcastReceiver in trace

Simple name is empty when the class is anonymous. It also doesn't show the 
enclosing class name so it's not always useful. Switch to full class name instead.

Bug: 417068952
Test: presubmit
FLAG: EXEMPT trace
Change-Id: I392e7ec613842b7115f9fa3eba75b9aaabef9b9d