* Handle misencoding of login_source cfg in mssql
Unfortunately due a bug in xorm (see https://gitea.com/xorm/xorm/pulls/1957) updating
loginsources on MSSQL causes them to become corrupted. (#16252)
Whilst waiting for the referenced PR to be merged and to handle the corrupted
loginsources correctly we need to add a wrapper to the `FromDB()` methods to look
for and ignore the misplaced BOMs that have been added.
Fix#16252
Signed-off-by: Andrew Thornton <art27@cantab.net>
* Update models/login_source.go