Restore kotlin-dsl extension available on `NamedDomainObjectContainer<T>`

build-logic/convention/src/main/kotlin/com/google/samples/apps/nowinandroid/NiaFlavor.kt

@@ -4,6 +4,7 @@ import com.android.build.api.dsl.ApplicationExtension
 import com.android.build.api.dsl.ApplicationProductFlavor
 import com.android.build.api.dsl.CommonExtension
 import com.android.build.api.dsl.ProductFlavor
+import org.gradle.kotlin.dsl.invoke
 
 @Suppress("EnumEntryName")
 enum class FlavorDimension {
@@ -28,12 +29,12 @@ fun configureFlavors(
             flavorDimensions += flavorDimension.name
         }
 
-        productFlavors.apply flavors@{
+        productFlavors {
             NiaFlavor.entries.forEach { niaFlavor ->
                 register(niaFlavor.name) {
                     dimension = niaFlavor.dimension.name
                     flavorConfigurationBlock(this, niaFlavor)
-                    if (this@flavors is ApplicationExtension && this is ApplicationProductFlavor) {
+                    if (commonExtension is ApplicationExtension && this is ApplicationProductFlavor) {
                         if (niaFlavor.applicationIdSuffix != null) {
                             applicationIdSuffix = niaFlavor.applicationIdSuffix
                         }