To improve unit test of live copy.

We may consider kind of creating new FakeMagnoliaUI but for registering dialog and template definition instead to reduce effort and maintain all fields and template in future better

More examples can be found in other modules. See 

• AppWithContentTypeTest.java
• ContentTypeAppsTest.java
• FakeMagnoliaUI.java
• fooModule/dialogs
• TemplatesTest.java
• DialogTest.java

Acceptance criteria:

• Improve src/test/java/info/magnolia/livecopy/actions/rewire/* that we have now in LC, do not need to propose new test case