Fix tab underline in chapter settings sheet

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

@@ -8,14 +8,15 @@
 
     <androidx.constraintlayout.widget.ConstraintLayout
         android:layout_width="match_parent"
-        android:layout_height="wrap_content">
+        android:layout_height="wrap_content"
+        android:background="@drawable/transparent_tabs_background">
 
         <!-- Remove background color so rounded sheet corners work -->
         <com.google.android.material.tabs.TabLayout
             android:id="@+id/tabs"
             android:layout_width="0dp"
             android:layout_height="wrap_content"
-            android:background="@drawable/transparent_tabs_background"
+            android:background="@android:color/transparent"
             app:layout_constraintBottom_toBottomOf="parent"
             app:layout_constraintEnd_toStartOf="@+id/menu"
             app:layout_constraintStart_toStartOf="parent"