Fix wasm url issue for the jbig2 decoder

and add a test for jbig2 decoding with the js decoder.

src/core/jbig2_wasm.js

@@ -63,7 +63,7 @@ class JBig2WasmImage {
       return successCallback(results.instance);
     } catch (reason) {
       warn(`JBig2Image#instantiateWasm: ${reason}`);
-      return null;
+      return fallbackCallback(null);
     } finally {
       this.#handler = null;
     }

test/test_manifest.json

@@ -13139,5 +13139,14 @@
     "rounds": 1,
     "link": true,
     "type": "eq"
+  },
+  {
+    "id": "JBIG2Globals_nowasm",
+    "file": "pdfs/JBIG2Globals.pdf",
+    "md5": "78ee015a604678a4efbdcd993e0d77aa",
+    "rounds": 1,
+    "link": true,
+    "type": "eq",
+    "useWasm": false
   }
 ]