MediaMuxer:Maintain proper state after stop()

MediaMuxer.java: move to stop state even if nativeStop() throws
exception.
android_media_MediaMuxer.java: revert recent change, throw
only runtime exception for any error as it used to be. Log error now.

Bug: 156649746

Test: atest android.media.cts.MediaMuxerTest
      atest android.media.cts.MediaRecorderTest
      atest android.mediav2.cts.MuxerTest

Change-Id: I82e16fcb065a40f25036bbad181798f1fd36132b