Hide screen-sharing button in Element Call on desktop (#9423)

src/models/Call.ts

@@ -41,6 +41,7 @@ import { ElementWidgetActions } from "../stores/widgets/ElementWidgetActions";
 import WidgetStore from "../stores/WidgetStore";
 import { WidgetMessagingStore, WidgetMessagingStoreEvent } from "../stores/widgets/WidgetMessagingStore";
 import ActiveWidgetStore, { ActiveWidgetStoreEvent } from "../stores/ActiveWidgetStore";
+import PlatformPeg from "../PlatformPeg";
 
 const TIMEOUT_MS = 16000;
 
@@ -635,6 +636,10 @@ export class ElementCall extends Call {
             deviceId: client.getDeviceId(),
             roomId: groupCall.getRoomId()!,
         });
+        // Currently, the screen-sharing support is the same is it is for Jitsi
+        if (!PlatformPeg.get().supportsJitsiScreensharing()) {
+            params.append("hideScreensharing", "");
+        }
         url.hash = `#?${params.toString()}`;
 
         // To use Element Call without touching room state, we create a virtual