chore(Config): updated hasDarkThemeSwitcher var

Author: thatblindgeye

packages/module/patternfly-docs/patternfly-docs.config.js

@@ -3,5 +3,5 @@ module.exports = {
   sideNavItems: [{ section: 'extensions' }],
   topNavItems: [],
   port: 8006,
-  hasDarkThemeSwitcher: true,
+  hasThemeSwitcher: true,
 };