deps: react-share 2 -> 5 (drops its defaultProps warnings)

react-share 2.0 shipped function components with defaultProps (CreatedButton,
Icon) -> React-19-blocking warnings on fire-detail pages. v5 is React-18-safe
and drops them. Removed the GooglePlusShareButton/Icon (Google+ is dead;
removed from react-share in v4+); the other 6 buttons (Facebook, Twitter,
Telegram, WhatsApp, Reddit, Email) are API-compatible. Browser-verified 6
buttons render, no defaultProps warnings. REST smoke byte-identical.

imports/ui/components/ShareIt/ShareIt.js

@@ -8,7 +8,6 @@ import { withTracker } from 'meteor/react-meteor-data';
 import { currentLocationHref } from '/imports/ui/components/Utils/location';
 import {
   FacebookShareButton,
-  GooglePlusShareButton,
   TwitterShareButton,
   TelegramShareButton,
   WhatsappShareButton,
@@ -16,7 +15,6 @@ import {
   EmailShareButton,
 
   FacebookIcon,
-  GooglePlusIcon,
   TwitterIcon,
   TelegramIcon,
   WhatsappIcon,
@@ -94,15 +92,6 @@ class ShareIt extends Component {
           </div>
         </div>
 
-        <div className="share_it">
-          <GooglePlusShareButton
-              url={shareUrl}
-              className="share_it__share-button"
-          >
-            <GooglePlusIcon size={32} round />
-          </GooglePlusShareButton>
-        </div>
-
         <div className="share_it">
           <RedditShareButton
               url={shareUrl}
@@ -135,9 +124,6 @@ ShareIt.propTypes = {
   title: PropTypes.string.isRequired
 };
 
-ShareIt.defaultProps = {
-};
-
 export default withTranslation()(withTracker((props) => {
   const { title } = props;
   return {