Bug 1873766: Fix VPN icon in light mode r=teshaq,desktop-theme-reviewers,sfoster

Differential Revision: https://phabricator.services.mozilla.com/D198442

browser/base/content/browser-sync.js

@@ -821,6 +821,7 @@ var gSync = {
       // we should show the PXI panel instead of taking the user
       // straight to FxA sign-in
       if (this.PXI_TOOLBAR_ENABLED) {
+        this.updateFxAPanel(UIState.get());
         this.updateCTAPanel();
         PanelUI.showSubView("PanelUI-fxa", anchor, aEvent);
       } else {