SegmentedViewController : add the unreachable homeserver management (i.e. the navbar background color becomes red)

Vector/ViewController/RoomViewController.m

@@ -245,6 +245,9 @@
             MXSession* session = self.roomDataSource.mxSession;
             NSString* roomid = self.roomDataSource.roomId;
             
+            // to display a red navbar when the home server cannot be reached.
+            [segmentedViewController addMatrixSession:session];
+            
             NSMutableArray* viewControllers = [[NSMutableArray alloc] init];
             NSMutableArray* titles = [[NSMutableArray alloc] init];
             
@@ -260,6 +263,7 @@
             [settingsViewController initWithSession:session andRoomId:roomid];
             [viewControllers addObject:settingsViewController];
             
+            
             segmentedViewController.title = NSLocalizedStringFromTable(@"room_details_title", @"Vector", nil);
             [segmentedViewController initWithTitles:titles viewControllers:viewControllers defaultSelected:0];
         }