Update to the AAB directory layout

Follow-up to https://github.com/godotengine/godot/pull/106152 to address the regression described in https://github.com/godotengine/godot/issues/106582

platform/android/java/app/assetPackInstallTime/build.gradle

@@ -0,0 +1,10 @@
+plugins {
+    id 'com.android.asset-pack'
+}
+
+assetPack {
+    packName = "assetPackInstallTime" // Directory name for the asset pack
+    dynamicDelivery {
+        deliveryType = "install-time" // Delivery mode
+    }
+}