Fix focusability of battery history chart

Change-Id: I0bd0da84a08ed6e3c51da3dc6a68e878c5c0d3cd
Fixes: 29453492

res/layout/battery_history_detail.xml

@@ -22,6 +22,11 @@
     android:paddingEnd="?android:attr/listPreferredItemPaddingEnd"
     android:orientation="vertical">
 
+    <LinearLayout
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:focusable="true"
+        android:orientation="vertical">
         <TextView
             android:id="@+id/charge"
             android:layout_width="match_parent"
@@ -46,6 +51,7 @@
             android:colorAccent="?android:attr/colorAccent"
             android:gravity="end"
             settings:textColor="?android:attr/textColorSecondary" />
+    </LinearLayout>
 
     <View
         android:layout_width="match_parent"