Output blank png image when use custom font family in windows

**Describe the bug**

Output blank png image when use custom font family in windows

**To Reproduce**
Steps to reproduce the behavior:
1. Execute `freeze -x "echo Something" --font.family "Microsoft YaHei" -o freeze.png` 
2. Execute `explorer freeze.png`

**Expected behavior**

Got an blank image.

**Screenshots**
If applicable, add screenshots to help explain your problem.
![Snipaste_2024-04-17_20-49-36](https://github.com/charmbracelet/freeze/assets/2217024/4e5bdf90-aea6-4913-9cdb-1ff3f99433ee)

**Desktop (please complete the following information):**
 - OS: Microsoft Windows 
 - Browser chrome
 - Version 23H2 10.0.22635.3495

**Additional context**

Load the default fonts dir may help this

https://github.com/charmbracelet/freeze/blob/80803ebd021ee31dacdf77dca2674d05b0c81b8b/png.go#L50-L57

```golang
fontdb.LoadFontsDir(OS_FONTS_DIR)
```


	err = fontdb.LoadFontData(font.JetBrainsMonoTTF)
	if err != nil {
	printErrorFatal("Unable to load font", err)
	}
	err = fontdb.LoadFontData(font.JetBrainsMonoNLTTF)
	if err != nil {
	printErrorFatal("Unable to load font", err)
	}

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Output blank png image when use custom font family in windows #80

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Output blank png image when use custom font family in windows #80

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