Variables starting with `$` are removed

[pdonias]

Describe the bug
Variables starting with $ are removed.

To Reproduce

1. Open a new file
2. Paste the following code

const $foo = 42

3. Select the code
4. Run Minify: Selection
5. The output is:

const =42;

Expected behavior
The following code (or similar):

const $foo=42;

Desktop (please complete the following information):

• OS: Ubuntu 20.04
• Version: 3.3.2

[SArpnt]

a $ and anything after in a variable is removed, for example

let foo$bar = 0;

becomes

let foo=0;