remove unused foreground (which was working only on API23+)

Signed-off-by: tobiasKaminsky <tobias@kaminsky.me>

src/main/res/layout/list_item.xml

@@ -23,7 +23,6 @@
     android:layout_height="@dimen/standard_list_item_size"
     android:baselineAligned="false"
     android:descendantFocusability="blocksDescendants"
-    android:foreground="?android:attr/selectableItemBackground"
     android:orientation="horizontal">
 
     <androidx.constraintlayout.widget.ConstraintLayout

src/main/res/layout/unified_search_footer.xml

@@ -25,7 +25,6 @@
     android:layout_width="match_parent"
     android:layout_height="@dimen/min_list_item_size"
     android:baselineAligned="false"
-    android:foreground="?android:attr/selectableItemBackground"
     android:orientation="horizontal">
 
 

src/main/res/layout/unified_search_item.xml

@@ -26,7 +26,6 @@
     android:layout_width="match_parent"
     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">