Finish the activity when the VM stops.

Bug: 380368783
Change-Id: I44184a90ed3bd103d32c642a0065fd4a4827880e
Test: stop vm via notification
diff --git a/android/TerminalApp/java/com/android/virtualization/terminal/MainActivity.java b/android/TerminalApp/java/com/android/virtualization/terminal/MainActivity.java
index eb0e7e2..da6a6ed 100644
--- a/android/TerminalApp/java/com/android/virtualization/terminal/MainActivity.java
+++ b/android/TerminalApp/java/com/android/virtualization/terminal/MainActivity.java
@@ -379,6 +379,7 @@
     @Override
     public void onVmStop() {
         Log.i(TAG, "onVmStop()");
+        finish();
     }
 
     @Override