style: fix variable name and funtion

Author: dcoa

src/react/hooks/paragon/useParagonThemeCore.js

@@ -85,9 +85,9 @@ const useParagonThemeCore = ({
             coreThemeLink = createCoreThemeLink(coreThemeFallbackUrl, { isFallbackThemeUrl: true, isBrandOverride });
             const otherExistingLinks = getExistingCoreThemeLinks(isBrandOverride);
             removeExistingLinks(otherExistingLinks);
-            const foundParagonThemCoreLink = getParagonThemeCoreLink();
-            if (foundParagonThemCoreLink) {
-              foundParagonThemCoreLink.insertAdjacentElement(
+            const foundParagonThemeCoreLink = getParagonThemeCoreLink();
+            if (foundParagonThemeCoreLink) {
+              foundParagonThemeCoreLink.insertAdjacentElement(
                 'afterend',
                 coreThemeLink,
               );

src/react/hooks/useAppEvent.js

@@ -17,9 +17,7 @@ const useAppEvent = (type, callback) => {
   useEffect(() => {
     const subscriptionToken = subscribe(type, callback);
 
-    return function cleanup() {
-      unsubscribe(subscriptionToken);
-    };
+    return () => unsubscribe(subscriptionToken);
   }, [callback, type]);
 };