[file_packager] Pass module object to runWithFS (#22086)

This makes it robust against #21775 in case we try to re-land it.

callRuntimeCallbacks passes the actual Module, so use it.

Author: past-due

tools/file_packager.py

@@ -1094,12 +1094,12 @@ def generate_js(data_target, data_files, metadata):
       }\n'''
 
   ret += '''
-    function runWithFS() {\n'''
+    function runWithFS(Module) {\n'''
   ret += code
   ret += '''
     }
     if (Module['calledRun']) {
-      runWithFS();
+      runWithFS(Module);
     } else {
       if (!Module['preRun']) Module['preRun'] = [];
       Module["preRun"].push(runWithFS); // FS is not initialized yet, wait for it