Disable resource optimizations for release builds as it breaks the legacy build system.

platform/android/java/gradle.properties

@@ -1,4 +1,6 @@
 # Project-wide Gradle settings.
+# NOTE: This should be kept in sync with 'godot/platform/android/java/app/gradle.properties' except
+# where otherwise specified.
 
 # IDE (e.g. Android Studio) users:
 # Gradle settings configured through the IDE *will override*
@@ -20,3 +22,7 @@ org.gradle.jvmargs=-Xmx4536m
 # org.gradle.parallel=true
 
 org.gradle.warning.mode=all
+
+# Disable resource optimizations for template release build.
+# NOTE: This is turned on for custom build in order to improve the release build.
+android.enableResourceOptimizations=false