Asks if LibreOffice details should be updated after no changes are made

[bluesabre]

Imported from Launchpad, LP: #1774803

Testing Xubunto 18.10.
Mugshot: mugshot 0.4.0

When I open mugshot 0.4.0, change nothing and click "apply", I get the question: "Update libreoffice user details? Would you also like to update your user details in libreoffice?"

I think when there are no changes, this question is not necessary.