Checkmk Werk 12743: Fix handling of start url in user profile

ID: 12743 Title: Fix handling of start url in user profile Component: Multisite Level: 1 Class: Bug fix Version: 2.1.0i1 This werk fixes two problems regarding the start url option in the user profile settings. The values of this settings were only taken into account, if the option "Set as start URL" in dashboards was used. Existing entries were not recognized. Furthermore, it was not possible to edit and save a user profile of a user, who has used the option "Set as start URL", leading into an error "The given value is not allowed. You may only configure relative URLs".