fix(ui): fix warnings for few components

frontend/app/components/Session_/EventsBlock/EventGroupWrapper.js

@@ -58,7 +58,6 @@ class EventGroupWrapper extends React.PureComponent {
       >
         { isFirst && isLocation && event.referrer &&
           <div className={ stl.referrer }>
-            {/* Referrer: <span className={stl.url}>{ event.referrer }</span> */}
             <TextEllipsis>
               Referrer: <span className={stl.url}>{ event.referrer }</span>
             </TextEllipsis>

frontend/app/components/Session_/Issues/IssuesModal.js

@@ -3,7 +3,7 @@ import stl from './issuesModal.module.css';
 import IssueForm from './IssueForm';
 import { Icon } from 'UI';
 
-const IssuesModal = React.forwardRef(({
+const IssuesModal = ({
   sessionId,
   closeHandler,
   provider
@@ -17,6 +17,6 @@ const IssuesModal = React.forwardRef(({
       <IssueForm sessionId={ sessionId } closeHandler={ closeHandler } />
     </div>
   );
-})
+}
 
 export default IssuesModal;

frontend/app/components/Session_/Player/Controls/Timeline.js

@@ -182,6 +182,7 @@ export default class Timeline extends React.PureComponent {
                     top: '-30px'
                     //width: `${ 2000 * scale }%`
                   } } 
+                  key={iss.key}
                   className={ stl.clickRage }
                   onClick={ this.createEventClickHandler(iss) }
                 >
@@ -203,6 +204,7 @@ export default class Timeline extends React.PureComponent {
                   top: '-30px'
                   //width: `${ 2000 * scale }%`
                 } } 
+                key={e.key}
                 className={ stl.clickRage }
                 onClick={ this.createEventClickHandler(e) }
               >