Shortened URL is lost when the page is moved

[iuliabalan]

Steps to reproduce:

• on a page Get Shortened URL

• then when checking in object mode you'll see the pageID in the associated objects of type URLShortener.Code.URLShortenerClass

• move the page to another location
  Expected behaviour:

• the object URLShortener.Code.URLShortenerClass containing the generated pageID should be kept after the page was moved

Actual behaviour:

• checking in object mode after the page move you'll notice the objects of type URLShortener.Code.URLShortenerClass was lost.

Reproduced on XWiki 16.4.6 with URL Shortener Application (Pro) v1.2.2