fix(set due date dialog): set TabLayout background to transparent

- fixes tab layout color inconsistency in set due date dialog when theme is black/dark

- Ref: #19936

Author: Haz3-jolt

AnkiDroid/src/main/res/layout/dialog_set_due_date.xml

@@ -30,6 +30,7 @@
 
         <com.google.android.material.tabs.TabLayout
             android:id="@+id/tab_layout"
+            android:background="@android:color/transparent"
             android:orientation="vertical"
             android:layout_width="match_parent"
             android:layout_height="wrap_content"