fix(ios): remove brownie and react brownfield exported directives (#240)

* fix(ios): remove brownie exported import

* fix: remove exported directive

Author: hurali97

packages/react-native-brownfield/src/expo-config-plugin/template/ios/FrameworkInterface.swift

@@ -1,6 +1,5 @@
-// Export helpers from @callstack/react-native-brownfield library
-@_exported import ReactBrownfield
-@_exported import Brownie
+import Foundation
+import ReactBrownfield
 
 // Initializes a Bundle instance that points at the framework target.
 public let ReactNativeBundle = Bundle(for: InternalClassForBundle.self)