Fix download queue cutting off if too short

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

@@ -8,7 +8,7 @@
     <androidx.recyclerview.widget.RecyclerView
         android:id="@+id/recycler"
         android:layout_width="match_parent"
-        android:layout_height="wrap_content"
+        android:layout_height="match_parent"
         tools:listitem="@layout/download_item" />
 
     <eu.kanade.tachiyomi.widget.EmptyView