Remove drawable/background

Author: ZiadMontaser

lam7a/android/app/src/main/res/drawable-night/launch_background.xml

@@ -4,7 +4,6 @@
     <style name="LaunchTheme" parent="@android:style/Theme.Black.NoTitleBar">
         <!-- Show a splash screen on the activity. Automatically removed when
              the Flutter engine draws its first frame -->
-        <item name="android:windowBackground">@drawable/launch_background</item>
         <item name="android:forceDarkAllowed">false</item>
         <item name="android:windowFullscreen">false</item>
         <item name="android:windowDrawsSystemBarBackgrounds">false</item>

lam7a/android/app/src/main/res/drawable-v21/background.png

@@ -4,7 +4,6 @@
     <style name="LaunchTheme" parent="@android:style/Theme.Light.NoTitleBar">
         <!-- Show a splash screen on the activity. Automatically removed when
              the Flutter engine draws its first frame -->
-        <item name="android:windowBackground">@drawable/launch_background</item>
         <item name="android:forceDarkAllowed">false</item>
         <item name="android:windowFullscreen">false</item>
         <item name="android:windowDrawsSystemBarBackgrounds">false</item>