[embind] Fix type in overloadTable error checking. NFC

Author: sbc100

src/embind/embind.js

@@ -124,7 +124,7 @@ var LibraryEmbind = {
       // We are exposing a function with the same name as an existing function. Create an overload table and a function selector
       // that routes between the two.
       ensureOverloadTable(Module, name, name);
-      if (Module.hasOwnProperty(numArguments)) {
+      if (Module[name].overloadTable.hasOwnProperty(numArguments)) {
         throwBindingError(`Cannot register multiple overloads of a function with the same number of arguments (${numArguments})!`);
       }
       // Add the new function into the overload table.

test/code_size/embind_hello_wasm.json

@@ -1,10 +1,10 @@
 {
   "a.html": 552,
   "a.html.gz": 380,
-  "a.js": 9727,
-  "a.js.gz": 4295,
+  "a.js": 9732,
+  "a.js.gz": 4296,
   "a.wasm": 7730,
   "a.wasm.gz": 3507,
-  "total": 18009,
-  "total_gz": 8182
+  "total": 18014,
+  "total_gz": 8183
 }