Fix bug where clicks on the manual tuner woudl fall through to the
underlying fragment.

This occurs because the manual tuner fragment is added to the backstack
instead of replacing the radio display fragment. So, because the parent
view was not clickable, then the clicks fell through.

Test: manually tested
Bug: 32380459
Change-Id: I9e1d081d7ed2b5dfb9eafcc7f69bbf9d6fbf5cda
diff --git a/res/layout/manual_tuner.xml b/res/layout/manual_tuner.xml
index 46ce497..0586920 100644
--- a/res/layout/manual_tuner.xml
+++ b/res/layout/manual_tuner.xml
@@ -19,8 +19,11 @@
     android:layout_height="match_parent"
     android:paddingTop="@dimen/lens_header_height" >
 
+    <!-- This LinearLayout is clickable so that clicks do not fall through to the underlying
+         fragment. -->
     <LinearLayout
         android:background="@color/car_card"
+        android:clickable="true"
         android:layout_width="match_parent"
         android:layout_height="match_parent"
         android:paddingTop="@dimen/manual_tuner_top_padding">