Remove source filter sheet solid background (#6850)

Co-authored-by: CrepeTF <trungnguyen02@outlookcom>

app/src/main/res/layout/source_filter_sheet.xml

@@ -8,11 +8,10 @@
     <androidx.constraintlayout.widget.ConstraintLayout
         android:layout_width="match_parent"
         android:layout_height="?attr/actionBarSize"
-        android:background="?attr/colorSurface"
+        android:background="@drawable/transparent_tabs_background"
         android:elevation="2dp"
         android:gravity="center"
-        android:paddingStart="?attr/listPreferredItemPaddingStart"
-        android:paddingEnd="?attr/listPreferredItemPaddingEnd">
+        android:paddingHorizontal="?attr/listPreferredItemPaddingStart">
 
         <Button
             android:id="@+id/reset_btn"