hmm.json missing hscript-improved.

### Describe your bug here.

I think the title pretty much explains it, but hscript-improved is missing from hmm.json.

### Command Prompt/Terminal logs (if existing)

```bash

```

### Are you modding a build from source or with Lua?

Lua

### What is your build target?

HTML5

### Did you edit anything in this build? If so, mention or summarize your changes.

no