flutter: android: Replace splash screen color to burly_wood

src/ui/flutter_app/android/app/src/main/res/drawable/launch_background.xml

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <!-- Modify this file to customize your launch splash screen -->
 <layer-list xmlns:android="http://schemas.android.com/apk/res/android">
-    <item android:drawable="@color/aths_special" />
+    <item android:drawable="@color/burly_wood" />
 
     <!-- You can insert your own image assets here -->
     <!-- <item>

src/ui/flutter_app/android/app/src/main/res/values/colors.xml

@@ -4,4 +4,5 @@
     <color name="black">#000000</color>
     <color name="asparagus">#769656</color>
     <color name="aths_special">#eeeed2</color>
+    <color name="burly_wood">#deb887</color>
 </resources>

src/ui/flutter_app/android/app/src/main/res/values/styles.xml

@@ -10,9 +10,9 @@
          This theme determines the color of the Android Window while your
          Flutter UI initializes, as well as behind your Flutter UI while its
          running.
-         
+
          This Theme is only used starting with V2 of Flutter's Android embedding. -->
     <style name="NormalTheme" parent="@android:style/Theme.Black.NoTitleBar">
-        <item name="android:windowBackground">@color/aths_special</item>
+        <item name="android:windowBackground">@color/burly_wood</item>
     </style>
 </resources>