Fix electron typing again again (#7788)

src/@types/global.d.ts

@@ -109,12 +109,16 @@ declare global {
         mxActiveWidgetStore?: ActiveWidgetStore;
         mxSkinner?: Skinner;
         mxOnRecaptchaLoaded?: () => void;
-        electron?: {}; // we should not rely on any fields on this in this layer
+        electron?: Electron;
         mxSendSentryReport: (userText: string, issueUrl: string, error: Error) => Promise<void>;
         mxLoginWithAccessToken: (hsUrl: string, accessToken: string) => Promise<void>;
         mxAutoRageshakeStore?: AutoRageshakeStore;
     }
 
+    interface Electron {
+        // will be extended by element-web downstream
+    }
+
     interface DesktopCapturerSource {
         id: string;
         name: string;