Fix msg layout

app/src/leanback/res/layout/view_widget_cast.xml

@@ -104,6 +104,7 @@
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             android:layout_marginTop="16dp"
+            android:gravity="center"
             android:textColor="@color/white"
             android:textSize="16sp"
             tools:text="@string/error_play_url" />

app/src/leanback/res/layout/view_widget_live.xml

@@ -90,6 +90,7 @@
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             android:layout_marginTop="16dp"
+            android:gravity="center"
             android:textColor="@color/white"
             android:textSize="16sp"
             tools:text="@string/error_play_url" />

app/src/leanback/res/layout/view_widget_vod.xml

@@ -91,6 +91,7 @@
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             android:layout_marginTop="16dp"
+            android:gravity="center"
             android:textColor="@color/white"
             android:textSize="16sp"
             tools:text="@string/error_play_url" />

app/src/mobile/res/layout/view_widget_live.xml

@@ -26,6 +26,7 @@
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             android:layout_marginTop="8dp"
+            android:gravity="center"
             android:textColor="@color/white"
             android:textSize="14sp"
             tools:text="@string/error_play_url" />

app/src/mobile/res/layout/view_widget_vod.xml

@@ -26,6 +26,7 @@
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             android:layout_marginTop="8dp"
+            android:gravity="center"
             android:textColor="@color/white"
             android:textSize="14sp"
             tools:text="@string/error_play_url" />