fix: invoke RNSourceSets.configure after Gradle evaluation to properly read GP extension values

Author: artus9033

gradle-plugins/react/brownfield/src/main/kotlin/com/callstack/react/brownfield/plugin/RNBrownfieldPlugin.kt

@@ -45,11 +45,11 @@ class RNBrownfieldPlugin
                 project.evaluationDependsOn(EXPO_PROJECT_LOCATOR)
             }
 
-            RNSourceSets.configure(project, extension)
             projectConfigurations.setup()
             registerRClassTransformer()
 
             project.afterEvaluate {
+                RNSourceSets.configure(project, extension)
                 afterEvaluate()
 
                 if (this.isExpoProject) {