functions do not have the correct tokens with space after the function name

[alexr00]

Prerequisites

• Put an X between the brackets on this line if you have done all of the following:
  • Reproduced the problem in Safe Mode: http://flight-manual.atom.io/hacking-atom/sections/debugging/#using-safe-mode
  • Followed all applicable steps in the debugging guide: http://flight-manual.atom.io/hacking-atom/sections/debugging/
  • Checked the FAQs on the message board for common solutions: https://discuss.atom.io/c/faq
  • Checked that your issue isn't already filed: https://github.com/issues?utf8=✓&q=is%3Aissue+user%3Aatom
  • Checked that there is not already an Atom package that provides the described functionality: https://atom.io/packages

Description

[Description of the issue]

Steps to Reproduce

1. Open SCSS file
2. Write a function, add a space after the name as shown

@function testFunction ($x, $y, $z) {

}

Expected behavior: The space doesn't impact the token.

Actual behavior: The token changes when there's a space.

Reproduces how often: 100%

Versions

You can get this information from copy and pasting the output of atom --version and apm --version from the command line. Also, please include the OS and what version of the OS you're running.

Additional Information

Any additional information, configuration or data that might be necessary to reproduce the issue.

Originally from @whaaaley in microsoft/vscode#144125