Fix: remove unnecessary optional chain i left in (#3822)

## Description:

In PR 3654 i left an unnecessary question mark.

## Please complete the following:

- [x] I have added screenshots for all UI updates
- [x] I process any text displayed to the user through translateText()
and I've added it to the en.json file
- [x] I have added relevant tests to the test directory
- [x] I confirm I have thoroughly tested these changes and take full
responsibility for any bugs introduced

## Please put your Discord username so you can be contacted if a bug or
regression is found:

tryout33

src/client/graphics/layers/StructureIconsLayer.ts

@@ -350,7 +350,7 @@ export class StructureIconsLayer implements Layer {
       (scale <= ZOOM_THRESHOLD || !this.renderSprites);
     this.levelsStage!.visible = scale > ZOOM_THRESHOLD && this.renderSprites;
     if (this.renderer) {
-      this.renderer?.render(this.rootStage);
+      this.renderer.render(this.rootStage);
       mainContext.drawImage(this.renderer.canvas, 0, 0);
     }
   }