Simplify ActivityStarter and remove app start animation preference

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

@@ -1,30 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<LinearLayout
-    xmlns:android="http://schemas.android.com/apk/res/android"
-    xmlns:tools="http://schemas.android.com/tools"
-    android:layout_width="match_parent"
-    android:layout_height="match_parent"
-    android:clickable="true"
-    android:focusable="true"
-    android:foreground="?selectableItemBackground"
-    android:orientation="horizontal">
-
-    <com.airbnb.lottie.LottieAnimationView
-        android:id="@+id/icon"
-        android:background="@color/blue"
-        android:layout_width="64dp"
-        android:layout_height="64dp"
-        android:layout_gravity="center_vertical"
-        tools:rawRes="@raw/app_start_anim_fade"/>
-
-    <TextView
-        android:id="@+id/label"
-        android:layout_width="wrap_content"
-        android:layout_height="wrap_content"
-        android:maxLines="1"
-        android:ellipsize="end"
-        android:paddingStart="4dp"
-        android:paddingEnd="4dp"
-        android:layout_gravity="center_vertical"
-        tools:text="Fade"/>
-</LinearLayout>

app/src/main/res/xml/preferences_appearance.xml

@@ -56,7 +56,6 @@
             app:title="@string/preference_icon_shape" />
     </PreferenceCategory>
     <PreferenceCategory app:title="@string/preference_category_animations">
-        <de.mm20.launcher2.ui.preferences.AppStartAnimPreference app:title="@string/preference_app_start_animation" />
     </PreferenceCategory>
     <PreferenceCategory app:title="@string/preference_category_searchbar">
         <ListPreference