Fix lost colorization of function declaration names

[caleb531]

Requirements

• Filling out the template is required. Any pull request that does not include enough information to be reviewed in a timely manner may be closed at the maintainers' discretion.
• All new code requires tests to ensure against regressions

Description of the Change

A recent update to https://github.com/tree-sitter/tree-sitter-javascript restructured the way function declarations are constructed in the syntax tree. This change is not present in the latest stable Atom (v1.38.0 at the time of this writing), but is present when I forked language-javascript (v0.132.0 at the time of this writing).

In effect, when I cloned and linked language-javascript, the names for function declarations are no longer colorized.

Current:

This PR restores colorization for function declaration names, according to the new syntax tree structure.

After this PR is merged:

Syntax tree in Atom 1.38.0 (working):

Syntax tree in language-javascript 0.132.0 (what breaks things):

Alternate Designs

A different selector could theoretically be used, but function_declaration > identifier seemed most appropriate and consistent with what was already present in the grammar.

Benefits

Colorization for function declaration names is restored to its former glory!

Possible Drawbacks

None that I can see, as the change is small and limited in scope, and per my screenshot above, function expressions are not negatively impacted by this change.

Applicable Issues

N/A

[rsese]

Failure looks unrelated, we restarted it but same error.

[jasonrudolph]

Nice catch, @caleb531. Thanks for this fix! ⚡