Clean up pre-Lollipop compat attributes

app/src/main/res/layout/dialog_playback_parameter.xml

@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
 <ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
-    xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
@@ -154,7 +153,7 @@
             android:layout_alignParentEnd="true"
             android:clickable="true"
             android:focusable="true"
-            app:srcCompat="@drawable/ic_expand_more"
+            android:src="@drawable/ic_expand_more"
             tools:ignore="ContentDescription" />
 
         <LinearLayout