Update className from dishes-grid to item-grid

Changed the className of the div wrapping cooked items from 'dishes-grid' to 'item-grid' for consistency or improved styling.

Author: JorchCortez

src/Components/AchieveTabs/Cooking/index.tsx

@@ -24,7 +24,7 @@ const Cooking = ( {cookedItems, knownRecipes, alreadyCookedRecipes, totalRecipes
                     />))}
             </div>
             <br />
-            <div className="dishes-grid">
+            <div className="item-grid">
             { cookedItems ? 
                 cookedItems.map((d, i) =>
                     <ItemWithCounter