fixed "show categories" setting display

HISTORY.md

@@ -43,6 +43,7 @@
 ### 2021-10-14
 * gui, byob, objects: scroll custom category buttons if there are more than 6
 * gui, byob: scroll selected custom category button into view
+* gui: fixed "show categories" setting display
 
 ### 2021-10-12
 * scenes, store: store single palette setting per project (for making extensions)

src/gui.js

@@ -4190,7 +4190,7 @@ IDE_Morph.prototype.settingsMenu = function () {
         addPreference(
             'Show categories',
             () => this.toggleCategoryNames(),
-            this.scene.unifiedPalette,
+            this.scene.showCategories,
             'uncheck to hide\ncategory names\nin the palette',
             'check to show\ncategory names\nin the palette'
         );