Bugfix FXIOS-8680 - Clicking links open a new tab instead of opening …

…about:blank (#19376) (#19378)

(cherry picked from commit 77bf13f)

Co-authored-by: dicarobinho <61138287+dicarobinho@users.noreply.github.com>

firefox-ios/Client/Frontend/Browser/BrowserViewController/Extensions/BrowserViewController+WebViewDelegates.swift

@@ -47,7 +47,9 @@ extension BrowserViewController: WKUIDelegate {
             configuration: configuration
         )
 
-        newTab.url = URL(string: "about:blank")
+        if navigationAction.request.url == nil {
+            newTab.url = URL(string: "about:blank")
+        }
 
         return newTab.webView
     }