Add spacing on top of sources/extensions/migrate lists (#3751)

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

@@ -15,6 +15,7 @@
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
             android:clipToPadding="false"
+            android:paddingTop="8dp"
             android:paddingBottom="@dimen/action_toolbar_list_padding"
             tools:listitem="@layout/source_main_controller_card_header" />
 

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

@@ -10,6 +10,7 @@
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:clipToPadding="false"
+        android:paddingTop="8dp"
         android:paddingBottom="@dimen/action_toolbar_list_padding" />
 
     <eu.kanade.tachiyomi.widget.MaterialFastScroll

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

@@ -10,6 +10,7 @@
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:clipToPadding="false"
+        android:paddingTop="8dp"
         android:paddingBottom="@dimen/action_toolbar_list_padding"
         tools:listitem="@layout/source_main_controller_card_header" />