Incorrect setup for `WTSEnumerateProcesses()`.

## Actual behavior

The `pCount` parameter for this method is by `ref`, but it should be an `out` parameter just like it is for `WTSEnumerateSessions()` and the [documentation](https://learn.microsoft.com/en-us/windows/win32/api/wtsapi32/nf-wtsapi32-wtsenumerateprocessesw) says.

## Expected behavior

That the `pCount` parameter for `WTSEnumerateProcesses()` be an `out` parameter, not a `ref` parameter.

## Repro steps

1. `NativeMethods.txt` content:
```
WTSEnumerateProcessesW
```

2. `NativeMethods.json` content (if present):
N/A

3. Any of your own code that should be shared?

### Context

- CsWin32 version: 0.3.183
- Win32Metadata version (if explicitly set by project): N/A
- Target Framework: net472
- `LangVersion` (if explicitly set by project): N/A

Start by locating the metadata entry for WTSEnumerateProcessesW and compare its pCount parameter with WTSEnumerateSessions and the linked Windows documentation. Reproduce the generated signature using the provided NativeMethods.txt input, then verify that pCount is emitted as an out parameter rather than ref.

Written by the indexing model from the issue text.