Don't duplicate the Jbig2Error exception

Let `src/core/jbig2_ccittFax_wasm.js` import the existing exception, rather than duplicate its code.

Author: Snuffleupagus

src/core/jbig2_ccittFax_wasm.js

@@ -13,15 +13,10 @@
  * limitations under the License.
  */
 
-import { BaseException, warn } from "../shared/util.js";
 import { fetchBinaryData } from "./core_utils.js";
 import JBig2 from "../../external/jbig2/jbig2.js";
-
-class JBig2Error extends BaseException {
-  constructor(msg) {
-    super(msg, "Jbig2Error");
-  }
-}
+import { Jbig2Error } from "./jbig2.js";
+import { warn } from "../shared/util.js";
 
 class JBig2CCITTFaxWasmImage {
   static #buffer = null;
@@ -87,7 +82,7 @@ class JBig2CCITTFaxWasmImage {
     }
     const module = await this.#modulePromise;
     if (!module) {
-      throw new JBig2Error("JBig2 failed to initialize");
+      throw new Jbig2Error("JBig2 failed to initialize");
     }
     let ptr, globalsPtr;
 
@@ -118,7 +113,7 @@ class JBig2CCITTFaxWasmImage {
         module._jbig2_decode(ptr, size, width, height, globalsPtr, globalsSize);
       }
       if (!module.imageData) {
-        throw new JBig2Error("Unknown error");
+        throw new Jbig2Error("Unknown error");
       }
       const { imageData } = module;
       module.imageData = null;
@@ -139,4 +134,4 @@ class JBig2CCITTFaxWasmImage {
   }
 }
 
-export { JBig2CCITTFaxWasmImage, JBig2Error };
+export { JBig2CCITTFaxWasmImage };