[MM-54798] Convert ./components/widgets/separator/basic-separator.tsx to function component (#24788)

* chore(channels): convert basic separator to functional components

* chore: change to arrow function

---------

Co-authored-by: Mattermost Build <build@mattermost.com>

webapp/channels/src/components/widgets/separator/basic-separator.tsx

@@ -9,21 +9,20 @@ type Props = {
     children?: ReactNode;
 };
 
-export default class BasicSeparator extends React.PureComponent<Props> {
-    public render() {
-        const {children} = this.props;
-        return (
-            <div
-                data-testid='basicSeparator'
-                className='Separator BasicSeparator'
-            >
-                <hr className='separator__hr'/>
-                {children && (
-                    <div className='separator__text'>
-                        {children}
-                    </div>
-                )}
-            </div>
-        );
-    }
-}
+const BasicSeparator = ({children}: Props) => {
+    return (
+        <div
+            data-testid='basicSeparator'
+            className='Separator BasicSeparator'
+        >
+            <hr className='separator__hr'/>
+            {children && (
+                <div className='separator__text'>
+                    {children}
+                </div>
+            )}
+        </div>
+    );
+};
+
+export default React.memo(BasicSeparator);