Use same header layout for sources/extensions/migration

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

@@ -14,7 +14,7 @@
             android:id="@+id/ext_recycler"
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
-            tools:listitem="@layout/extension_card_header" />
+            tools:listitem="@layout/source_main_controller_card_header" />
 
     </eu.kanade.tachiyomi.widget.ThemedSwipeRefreshLayout>
 

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

@@ -9,7 +9,7 @@
         android:id="@+id/recycler"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
-        tools:listitem="@layout/source_main_controller_card" />
+        tools:listitem="@layout/source_main_controller_card_header" />
 
     <eu.davidea.fastscroller.FastScroller
         android:id="@+id/fast_scroller"

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

@@ -1,17 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
-    xmlns:tools="http://schemas.android.com/tools"
-    android:layout_width="match_parent"
-    android:layout_height="wrap_content">
-
-    <TextView
-        android:id="@+id/title"
-        style="@style/TextAppearance.Regular.SubHeading"
-        android:layout_width="wrap_content"
-        android:layout_height="wrap_content"
-        android:paddingStart="@dimen/material_component_text_fields_padding_above_and_below_label"
-        android:paddingTop="8dp"
-        android:paddingEnd="@dimen/material_component_text_fields_padding_above_and_below_label"
-        tools:text="Title" />
-
-</FrameLayout>