fix(developer): touch layout font test should be lower case

Fixes #9110.

Also, `!=` has higher precedence than `??`.

This returns a boolean result:

```
(platform.font?.toLowerCase() ?? '') != FTouchLayoutFont
```

But `!=` has higher precedence than `??` so this returns the font name:

```
platform.font?.toLowerCase() ?? '' != FTouchLayoutFont
```