Only show logo-navigation-offline when no custom logo.

Signed-off-by: Ivan Sein <ivan@nextcloud.com>

NextcloudTalk/NCAppBranding.h

@@ -37,6 +37,7 @@ extern NSString * const pushNotificationServer;
 extern BOOL const multiAccountEnabled;
 extern BOOL const forceDomain;
 extern NSString * const domain;
+extern BOOL const customNavigationLogo;
 
 // Theming
 + (UIColor *)brandColor;

NextcloudTalk/RoomsTableViewController.m

@@ -451,7 +451,9 @@ typedef void (^FetchRoomsCompletionBlock)(BOOL success);
 - (void)setOfflineAppearance
 {
     self.addButton.enabled = NO;
-    self.navigationItem.titleView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"navigationLogoOffline"]];
+    if (!customNavigationLogo) {
+        self.navigationItem.titleView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"navigationLogoOffline"]];
+    }
 }
 
 - (void)setOnlineAppearance