Unified search: solve RTL symmetry warnings

Signed-off-by: Álvaro Brey Vilas <alvaro.brey@nextcloud.com>

src/main/res/layout/unified_search_footer.xml

@@ -37,6 +37,7 @@
         android:gravity="center_vertical"
         android:orientation="vertical"
         android:paddingStart="@dimen/standard_quarter_padding"
+        android:paddingEnd="0dp"
         android:text="@string/load_more_results"
         android:textColor="@color/secondary_text_color"
         tools:text="Load more results">

src/main/res/layout/unified_search_item.xml

@@ -27,6 +27,7 @@
     android:layout_height="@dimen/standard_list_item_size"
     android:baselineAligned="false"
     android:foreground="?android:attr/selectableItemBackground"
+    android:paddingStart="0dp"
     android:paddingEnd="@dimen/standard_padding"
     android:orientation="horizontal">