[spaces] several fixes for pre release

- [When switching spaces, user and room tabs are not populated](https://github.com/vector-im/element-ios/issues/4889)
- [Explore rooms list in space has odd ordering](https://github.com/vector-im/element-ios/issues/4890)
- Fixed Coming Soon error for Explore rooms

Riot/Modules/TabBar/MasterTabBarController.m

@@ -283,6 +283,9 @@
     
     [self initializeDataSources];
     
+    // Need to be called in case of the controllers have been replaced
+    [self.selectedViewController viewWillAppear:NO];
+
     // Adjust the display of the icons in the tabbar.
     for (UITabBarItem *tabBarItem in self.tabBar.items)
     {
@@ -299,6 +302,9 @@
     }
     
     titleView.titleLabel.text = self.selectedViewController.accessibilityLabel;
+    
+    // Need to be called in case of the controllers have been replaced
+    [self.selectedViewController viewDidAppear:NO];
 }
 
 #pragma mark -