fix linting issue

Author: gohanko

src/javascript/app_2/Modules/Trading/Components/Elements/purchase-button.jsx

@@ -28,9 +28,9 @@ const PurchaseButton = ({
             className={classNames(
                 'btn-purchase',
                 {
-                    'btn-purchase--disabled'           : (is_contract_mode || is_disabled) && !is_loading,
-                    'btn-purchase--animated--slide'    : is_loading && !should_fade,
-                    'btn-purchase--animated--fade'     : is_loading && should_fade,
+                    'btn-purchase--disabled'       : (is_contract_mode || is_disabled) && !is_loading,
+                    'btn-purchase--animated--slide': is_loading && !should_fade,
+                    'btn-purchase--animated--fade' : is_loading && should_fade,
                 })}
             has_effect
             onClick={() => { onClickPurchase(info.id, info.stake, type); }}