Scanner: do not skip LINE_BREAKs before .. and ...

[aibaars]

Checklist:

• All tests pass in CI.
• There are sufficient tests for the new fix/feature.
• Grammar rules have not been renamed unless absolutely necessary.
• The conflicts section hasn't grown too much.
• The parser size hasn't grown too much (check the value of STATE_COUNT in src/parser.c).

See also: #237

[hendrikvanantwerpen]

Looks good, and thanks as always for including clear test cases!