fix adding constant signal editing to puzzle editor (#1399)

src/js/game/modes/puzzle_edit.js

@@ -22,6 +22,7 @@ import { MetaTransistorBuilding } from "../buildings/transistor";
 import { HUDPuzzleEditorControls } from "../hud/parts/puzzle_editor_controls";
 import { HUDPuzzleEditorReview } from "../hud/parts/puzzle_editor_review";
 import { HUDPuzzleEditorSettings } from "../hud/parts/puzzle_editor_settings";
+import { HUDConstantSignalEdit } from "../hud/parts/constant_signal_edit";
 
 export class PuzzleEditGameMode extends PuzzleGameMode {
     static getId() {
@@ -58,6 +59,7 @@ export class PuzzleEditGameMode extends PuzzleGameMode {
         this.additionalHudParts.puzzleEditorControls = HUDPuzzleEditorControls;
         this.additionalHudParts.puzzleEditorReview = HUDPuzzleEditorReview;
         this.additionalHudParts.puzzleEditorSettings = HUDPuzzleEditorSettings;
+        this.additionalHudParts.constantSignalEdit = HUDConstantSignalEdit;
     }
 
     getIsEditor() {