feat(external_api): allow clipboard-write

modules/API/external/external_api.js

         const frameName = `jitsiConferenceFrame${id}`;
 
         this._frame = document.createElement('iframe');
-        this._frame.allow = 'camera; microphone; display-capture; autoplay;';
+        this._frame.allow = 'camera; microphone; display-capture; autoplay; clipboard-write';
         this._frame.src = this._url;
         this._frame.name = frameName;
         this._frame.id = frameName;

react/features/base/premeeting/components/web/CopyMeetingUrl.js

 import { Icon, IconCopy, IconCheck } from '../../../icons';
 import { connect } from '../../../redux';
 import { copyText, getDecodedURI } from '../../../util';
+import logger from '../../logger';
 
 type Props = {
 
             .then(() => {
                 this._showLinkCopied();
                 window.setTimeout(this._hideLinkCopied, COPY_TIMEOUT);
+            })
+            .catch(e => {
+                logger.error(e);
             });
     }