remove unused properties in list_item

Signed-off-by: Abdourahamane BOINAIDI <abdourahamane.boinaidi@infomaniak.com>

src/main/res/layout/list_item.xml

@@ -21,7 +21,6 @@
     android:id="@+id/ListItemLayout"
     android:layout_width="match_parent"
     android:layout_height="@dimen/standard_list_item_size"
-    android:background="@drawable/list_selector"
     android:baselineAligned="false"
     android:descendantFocusability="blocksDescendants"
     android:foreground="?android:attr/selectableItemBackground"