[BUG] Unable to parse enum class labels

[4e554c4c]

Describe the bug

Enum class labels which use the hash (#) character are not correctly parsed by tree-sitter-hack.

This means that # should also no longer parse comments

Requirements (place an x in each of the [ ])**

• [x] I've read and understood the Contributing guidelines and have done my best effort to follow them.
• [x] I've read and agree to the Code of Conduct.
• [x] I've searched for any related issues and avoided creating a duplicate issue.

Expected behavior

The following should parse as valid hack

E#B;

instead it parses as an unterminated statement:

(script [0, 0] - [1, 0]
  (ERROR [0, 0] - [0, 1]
    (identifier [0, 0] - [0, 1]))
  (comment [0, 1] - [0, 4]))