Remove the deprecated properties from the "presentationmodechanged" event (PR 12788 follow-up)

These properties have been deprecated in two releases now, hence we shouldn't need to keep this code around.

web/pdf_presentation_mode.js

@@ -155,28 +155,10 @@ class PDFPresentationMode {
     } else if (this.active) {
       state = PresentationModeState.FULLSCREEN;
     }
-
-    if (typeof PDFJSDev !== "undefined" && PDFJSDev.test("MOZCENTRAL")) {
     this.eventBus.dispatch("presentationmodechanged", {
       source: this,
       state,
     });
-    } else {
-      this.eventBus.dispatch("presentationmodechanged", {
-        source: this,
-        state,
-        get active() {
-          throw new Error(
-            "Deprecated parameter: `active`, please use `state` instead."
-          );
-        },
-        get switchInProgress() {
-          throw new Error(
-            "Deprecated parameter: `switchInProgress`, please use `state` instead."
-          );
-        },
-      });
-    }
   }
 
   /**