fix(screenshare): properly gate autopin behavior behind flag check

react/features/video-layout/subscriber.js

     /* selector */ state => state['features/base/tracks'],
     /* listener */ (tracks, store) => {
         if (typeof interfaceConfig !== 'object'
-            && !interfaceConfig.AUTO_PIN_LATEST_SCREEN_SHARE) {
+            || !interfaceConfig.AUTO_PIN_LATEST_SCREEN_SHARE) {
             return;
         }