fix: error in label followed by directive with single integer argument (ARMv7)

[cfung89]

Hello! There seems to be an error when there is a label followed by a directive (meta identifier) with only a single argument. The error does not happen with multiple arguments.

The following is an example of this issue with length: .word 4:

Before:

(program ; [0, 0] - [1, 0]
  (instruction ; [0, 0] - [0, 15]
    kind: (word) ; [0, 0] - [0, 6]
    (ERROR) ; [0, 6] - [0, 7]
    (ident ; [0, 8] - [0, 13]
      (meta_ident)) ; [0, 8] - [0, 13]
    (int))) ; [0, 14] - [0, 15]

Tree-sitter incorrectly identifies the length label as an instruction and thus has an ERROR node when parsing the : character.

After:

(program ; [0, 0] - [1, 0]
  (label ; [0, 0] - [0, 15]
    (ident) ; [0, 0] - [0, 6]
    (meta ; [0, 8] - [0, 15]
      kind: (meta_ident) ; [0, 8] - [0, 13]
      (int)))) ; [0, 14] - [0, 15]

Thanks!

[RubixDev]

looks great, thanks!