Revert merge from inverse

https://github.com/Zentyal/sogo/pull/150

Because the login on web with the use of outlook is broken after
including the DomainLessLogin feature

SoObjects/SOGo/SOGoDomainDefaults.h

@@ -68,6 +68,8 @@
 - (NSArray *) refreshViewIntervals;
 - (NSString *) subscriptionFolderFormat;
 
+- (NSString *) calendarDefaultCategoryColor;
+
 - (NSArray *) freeBusyDefaultInterval;
 - (int) davCalendarStartTimeLimit;