Fix screensharing in 1:1 calls (#9612)

Co-authored-by: Robin Townsend <[email protected]>

Author: dbkr

src/components/views/voip/LegacyCallView.tsx

@@ -293,11 +293,13 @@ export default class LegacyCallView extends React.Component<IProps, IState> {
             isScreensharing = await this.props.call.setScreensharingEnabled(false);
         } else {
             if (PlatformPeg.get().supportsDesktopCapturer()) {
-                const { finished } = Modal.createDialog(DesktopCapturerSourcePicker);
+                const { finished } = Modal.createDialog<[string]>(DesktopCapturerSourcePicker);
                 const [source] = await finished;
                 if (!source) return;
 
-                isScreensharing = await this.props.call.setScreensharingEnabled(true, source);
+                isScreensharing = await this.props.call.setScreensharingEnabled(true, {
+                    desktopCapturerSourceId: source,
+                });
             } else {
                 isScreensharing = await this.props.call.setScreensharingEnabled(true);
             }