Tokens: fix last use of property vs constant

Follow up on 1021, which addressed 500.

Oops... missed one ;-)

Author: jrfnl

src/Util/Tokens.php

@@ -948,7 +948,7 @@ public static function getHighestWeightedToken(array $tokens)
         $highest     = -1;
         $highestType = false;
 
-        $weights = self::$weightings;
+        $weights = self::WEIGHTINGS;
 
         foreach ($tokens as $token) {
             if (isset($weights[$token]) === true) {