Address some build warnings

(cherry picked from commit 2d7650537db907a4129f4a07db15950339b319e9)

# Conflicts:
#	README.md
#	app/src/main/java/eu/kanade/presentation/category/components/CategoryDialogs.kt
#	source-api/src/commonMain/kotlin/eu/kanade/tachiyomi/source/model/SManga.kt

app/src/main/res/drawable/ic_done_24dp.xml

@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24">
+    <path
+        android:fillColor="#FFF"
+        android:pathData="M9,16.2L4.8,12l-1.4,1.4L9,19 21,7l-1.4,-1.4L9,16.2z" />
+</vector>

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

@@ -1,5 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<androidx.recyclerview.widget.RecyclerView xmlns:android="http://schemas.android.com/apk/res/android"
-    android:id="@+id/recycler"
-    android:layout_width="match_parent"
-    android:layout_height="match_parent" />