fix: remove adaptive icon XML overrides so user PNG icons display correctly

Author: zhaojunru417

android/app/src/main/res/drawable-v24/ic_launcher_foreground.xml

@@ -2,6 +2,6 @@
 <layer-list xmlns:android="http://schemas.android.com/apk/res/android">
     <item android:drawable="@color/splashBackground" />
     <item
-        android:drawable="@drawable/ic_launcher_foreground"
+        android:drawable="@mipmap/ic_launcher"
         android:gravity="center" />
 </layer-list>

android/app/src/main/res/drawable/ic_launcher_background.xml

@@ -21,7 +21,7 @@
     -->
     <style name="AppTheme.NoActionBarLaunch" parent="Theme.SplashScreen">
         <item name="windowSplashScreenBackground">@color/splashBackground</item>
-        <item name="windowSplashScreenAnimatedIcon">@drawable/ic_launcher_foreground</item>
+        <item name="windowSplashScreenAnimatedIcon">@mipmap/ic_launcher</item>
         <item name="postSplashScreenTheme">@style/AppTheme.NoActionBar</item>
         <item name="android:background">@drawable/splash_background</item>
     </style>

android/app/src/main/res/drawable/splash_background.xml

@@ -0,0 +1,21 @@
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