Template with a node with forceInput='true' breaks ComfyUI

# Steps to reproduce:

- clean ComfyUI install
- add a trivial node with forceInput=True
```python
class IntToInt:
@classmethod
def INPUT_TYPES(cls):
return {"required": { "int": ( "INT", { "default": 0, "forceInput": True, }, ), } }

RETURN_TYPES = ("INT",)
FUNCTION = "int_to_int"
CATEGORY = "test"

def int_to_int(self, int):
return (int,)

NODE_CLASS_MAPPINGS = { "int to int" : IntToInt }
```
- add this node and a primitive
- Press 'Queue Prompt'
- Correct error message ("Prompt has no outputs") seen
- Select the two nodes and save them as a template
- Delete the two nodes
- Add them back as a template
- Press `Queue Prompt`
- No error message appears
- JS console shows infinite call stack

# Diagnosis

When a template is added with a `forceInput`, `hideWidget` is called twice:

This causes `serializeValue` to be replaced twice; the second time it is called `origSerializeValue` already points to the new `serializeValue`.

# Fix

Check if a widget has already been hidden at the start of `hideWidget` by inserting:

```javascript
function hideWidget(node, widget, suffix = "") {
if (widget.type?.startsWith(CONVERTED_TYPE) return;
```