Remove null check that was fixed in another PR

See https://github.com/matrix-org/matrix-react-sdk/pull/4255

src/utils/WidgetUtils.js

@@ -475,8 +475,6 @@ export default class WidgetUtils {
     }
 
     static getLocalJitsiWrapperUrl(opts: {forLocalRender?: boolean}) {
-        if (!opts) opts = {};
-
         // NB. we can't just encodeURIComponent all of these because the $ signs need to be there
         const queryString = [
             'conferenceDomain=$domain',