Use optional chaining rather than typeof checks when invoking the AnnotationStorage callbacks

This is a little bit shorter, and it should be fine considering that in the API there are no `typeof` checks when invoking user-provided callbacks (see e.g. `onPassword` and `onProgress`).

Author: Snuffleupagus

src/display/annotation_storage.js

@@ -100,14 +100,10 @@ class AnnotationStorage {
       this.resetModified();
     }
 
-    if (typeof this.onAnnotationEditor === "function") {
-      for (const value of this.#storage.values()) {
-        if (value instanceof AnnotationEditor) {
-          return;
-        }
-      }
-      this.onAnnotationEditor(null);
+    if (this.#storage.values().some(v => v instanceof AnnotationEditor)) {
+      return;
     }
+    this.onAnnotationEditor?.(null);
   }
 
   /**
@@ -135,9 +131,7 @@ class AnnotationStorage {
 
     if (value instanceof AnnotationEditor) {
       (this.#editorsMap ||= new Map()).set(value.annotationElementId, value);
-      if (typeof this.onAnnotationEditor === "function") {
-        this.onAnnotationEditor(value.constructor._type);
-      }
+      this.onAnnotationEditor?.(value.constructor._type);
     }
   }
 
@@ -157,18 +151,14 @@ class AnnotationStorage {
   #setModified() {
     if (!this.#modified) {
       this.#modified = true;
-      if (typeof this.onSetModified === "function") {
-        this.onSetModified();
-      }
+      this.onSetModified?.();
     }
   }
 
   resetModified() {
     if (this.#modified) {
       this.#modified = false;
-      if (typeof this.onResetModified === "function") {
-        this.onResetModified();
-      }
+      this.onResetModified?.();
     }
   }