ace-builds: empty theme css since v1.9.0

[gethinwebster]

Describe the bug

The output theme css is empty since a few releases, see:

https://github.com/ajaxorg/ace-builds/blob/master/css/theme/dawn.css
vs
https://github.com/ajaxorg/ace-builds/blob/74719e4dd46f0fe8948bb3b383d58fc2348ef128/css/theme/dawn.css

Also on NPM:
https://unpkg.com/browse/[email protected]/css/theme/dawn.css
vs
https://unpkg.com/browse/[email protected]/css/theme/dawn.css

This means that useStrictCSP mode (which loads those theme CSS files directly) is broken (see https://github.com/ajaxorg/ace-builds/blob/master/demo/csp.html) as no theme CSS is loaded.

Expected Behavior

The theme CSS files should be populated

Current Behavior

The theme CSS files are empty

Reproduction Steps

Install any version of ace-builds from 1.9 onwards

Possible Solution

No response

Additional Information/Context

No response

Ace Version

1.9