Add import for unit tests (1)

Author: ncooke3

FirebaseMLModelDownloader/Tests/Unit/ModelDownloaderUnitTests.swift

@@ -23,9 +23,8 @@
   @testable import FirebaseMLModelDownloader
   import XCTest
   #if SWIFT_PACKAGE
+    @_implementationOnly import GoogleUtilities_Logger
     @_implementationOnly import GoogleUtilities_UserDefaults
-
-//    @_implementationOnly import GoogleUtilities_Logger
   #else
     @_implementationOnly import GoogleUtilities
   #endif // SWIFT_PACKAGE