Use vector icon for splash screen in SDK < 26

Signed-off-by: Muntashir Al-Islam <muntashirakon@riseup.net>

Author: MuntashirAkon

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

@@ -0,0 +1,5 @@
+<!-- SPDX-License-Identifier: GPL-3.0-or-later -->
+<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
+    <item android:drawable="@color/ic_launcher_background"/>
+    <item android:drawable="@drawable/ic_launcher_foreground"/>
+</layer-list>

app/src/main/res/values/styles.xml

@@ -3,7 +3,7 @@
 
     <style name="AppTheme.Splash" parent="Theme.SplashScreen">
         <item name="windowSplashScreenBackground">?attr/colorSurface</item>
-        <item name="windowSplashScreenAnimatedIcon">@mipmap/ic_launcher_round</item>
+        <item name="windowSplashScreenAnimatedIcon">@drawable/ic_splash_logo</item>
         <item name="postSplashScreenTheme">@style/AppTheme</item>
     </style>