[quests] fix incorrect "long" icon in menu

Author: zhakk-harn

quests.html

@@ -266,7 +266,7 @@ <h1>Ateliernum</h1>
             <svg xmlns="http://www.w3.org/2000/svg" width="24" height="24">
               <use
                 style="--color: var(--purple)"
-                href="length_icons.svg#short"
+                href="length_icons.svg#long"
               ></use>
             </svg>
             <span>long</span>