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.m

@@ -294,6 +294,11 @@
   return [self stringForKey: @"SOGoLDAPContactInfoAttribute"];
 }
 
+- (NSString *) calendarDefaultCategoryColor
+{
+  return [self stringForKey: @"SOGoCalendarDefaultCategoryColor"];
+}
+
 - (NSArray *) freeBusyDefaultInterval
 {
   return [self arrayForKey: @"SOGoFreeBusyDefaultInterval"];