ref: rollback color changes for android-sample project

Author: android10

android-sample/app/src/main/kotlin/com/fernandocejas/sample/MainActivity.kt

@@ -64,8 +64,7 @@ class MainActivity : AppCompatActivity() {
             MaterialTheme {
                 Surface(
                     modifier = Modifier.fillMaxSize(),
-                    color = Color.Gray
-//                    color = MaterialTheme.colorScheme.background
+                    color = MaterialTheme.colorScheme.background
                 ) {
                     Column(modifier = Modifier.fillMaxSize()) {
                         MainScreenComponent()