Allow transfer site for same website were manga link is not the same

[dcostaz]

Is your feature request related to a problem? Please describe.
This functionality will help with sites that constantly change the manga IDs. Currently, the only solution is to replace each favorite item with a new one, which, in some cases, is a lot of work.

Describe the solution you'd like
In the favorite section, when selecting to transfer a site for an entry, allow the possibility of transferring it to an updated entry for the same site where the link has changed. In this case, the current downloads should be updated.

Describe alternatives you've considered
When loading mangas in the manga info tab, update the links for entries in the favorites tab if new entries with the same name and a different link are present. Currently, new entries are added even though the same manga name exists.

Additional context
I have noticed with the transfer functionality that even when selecting the "Clear downloaded chapter list ..." option when performing a full "Check" moments later, it recognizes all chapters available for download.