Merge pull request 'fix: Unparenthesized 'a ? b : c ? d : e' is not supported.' (#20) from Zorua/mediawiki-extensions-DarkMode:master into master

Reviewed-on: #20

includes/Hooks.php

@@ -48,7 +48,7 @@ class Hooks implements
             // On usedarkmode is set, overwrite the cookie.
             return (bool)$var;
         }
-        $varCookie = isset($_COOKIE['ext.DarkMode_usedarkmode']) ? $_COOKIE['ext.DarkMode_usedarkmode'] : isset($_COOKIE['usedarkmode']) ? $_COOKIE['usedarkmode'] : '';
+        $varCookie = (isset($_COOKIE['ext.DarkMode_usedarkmode']) ? $_COOKIE['ext.DarkMode_usedarkmode'] : isset($_COOKIE['usedarkmode'])) ? $_COOKIE['usedarkmode'] : '';
         if ($varCookie === '0' || $varCookie === '1') {
             // If usedarkmode not set, return cookie value.
             return (bool)$varCookie;