Aperture: Disable touch sounds for shutter button

We are handling shutter sounds ourselves.

Change-Id: I8bd81521d6c16af47c3f1fa8f84ba4f7ad64e16c
diff --git a/app/src/main/res/layout/activity_camera.xml b/app/src/main/res/layout/activity_camera.xml
index 90d3103..3a8b935 100644
--- a/app/src/main/res/layout/activity_camera.xml
+++ b/app/src/main/res/layout/activity_camera.xml
@@ -224,6 +224,7 @@
             android:layout_height="75dp"
             android:background="@null"
             android:contentDescription="@string/shutter_button_description"
+            android:soundEffectsEnabled="false"
             android:src="@drawable/avd_photo_capture"
             app:layout_constraintBottom_toBottomOf="parent"
             app:layout_constraintLeft_toLeftOf="parent"