[AnnotationEditorLayerBuilder] Inline the destroy code in the cancel method

It doesn't seem necessary to have a *separate* `destroy` method given that the `cancel` method always invokes it unconditionally.
In the `PDFPageView.reset` method we currently attempt to call `destroy` directly, however that'll never actually happen since either:
 - We're keeping the annotationEditorLayer, in which case we're just hiding the layer and nothing more (and the relevant branch is never entered).
 - We're removing the annotationEditorLayer, in which case the `PDFPageView.cancelRendering` method has already cancelled *and* nulled it (and there's thus nothing left to `destroy` here).

*Please note:* Hopefully I'm not overlooking something obvious here, since both reading through the code *and* also adding `console.log(this.annotationEditorLayer);` [before this line](9d4aadbf7a/web/pdf_page_view.js (L438)) suggests that it's indeed unnecessary.

web/annotation_editor_layer_builder.js

@@ -98,7 +98,13 @@ class AnnotationEditorLayerBuilder {
 
   cancel() {
     this._cancelled = true;
-    this.destroy();
+
+    if (!this.div) {
+      return;
+    }
+    this.pageDiv = null;
+    this.annotationEditorLayer.destroy();
+    this.div.remove();
   }
 
   hide() {
@@ -114,15 +120,6 @@ class AnnotationEditorLayerBuilder {
     }
     this.div.hidden = false;
   }
-
-  destroy() {
-    if (!this.div) {
-      return;
-    }
-    this.pageDiv = null;
-    this.annotationEditorLayer.destroy();
-    this.div.remove();
-  }
 }
 
 export { AnnotationEditorLayerBuilder };

web/pdf_page_view.js

@@ -431,18 +431,14 @@ class PDFPageView {
       // so they are not displayed on the already resized page.
       this.annotationLayer.hide();
     }
-
     if (annotationEditorLayerNode) {
       this.annotationEditorLayer.hide();
-    } else {
-      this.annotationEditorLayer?.destroy();
     }
     if (xfaLayerNode) {
       // Hide the XFA layer until all elements are resized
       // so they are not displayed on the already resized page.
       this.xfaLayer.hide();
     }
-
     if (textLayerNode) {
       this.textLayer.hide();
     }