android: fallbacck to speaker in ConnectionService handler

It has been our default for a while.

android/sdk/src/main/java/org/jitsi/meet/sdk/AudioDeviceHandlerConnectionService.java

      */
     private static int audioDeviceToRouteInt(String audioDevice) {
         if (audioDevice == null) {
-            return CallAudioState.ROUTE_EARPIECE;
+            return CallAudioState.ROUTE_SPEAKER;
         }
         switch (audioDevice) {
             case AudioModeModule.DEVICE_BLUETOOTH:
                 return CallAudioState.ROUTE_SPEAKER;
             default:
                 JitsiMeetLogger.e(TAG + " Unsupported device name: " + audioDevice);
-                return CallAudioState.ROUTE_EARPIECE;
+                return CallAudioState.ROUTE_SPEAKER;
         }
     }