Reimplement handling of "stop" button.

Appears this got lost in the changes from "case" to "if/else".

Bug: 224715583
Test: run test. Press "record" (note mic icon and button states),
  Press "stop" (not mic icon disappears and button states).
Change-Id: I93d4bc07ece5a4ac2ea1638cf60ef61ca1ec027a
diff --git a/apps/CtsVerifier/src/com/android/cts/verifier/audio/AudioInputRoutingNotificationsActivity.java b/apps/CtsVerifier/src/com/android/cts/verifier/audio/AudioInputRoutingNotificationsActivity.java
index 381ea9d..5ee2525 100644
--- a/apps/CtsVerifier/src/com/android/cts/verifier/audio/AudioInputRoutingNotificationsActivity.java
+++ b/apps/CtsVerifier/src/com/android/cts/verifier/audio/AudioInputRoutingNotificationsActivity.java
@@ -70,6 +70,8 @@
 
             if (v.getId() == R.id.audio_routingnotification_recordBtn) {
                 startRecording();
+            } else if (v.getId() == R.id.audio_routingnotification_recordStopBtn) {
+                stopRecording();
             }
         }
     }