prevent autocomplete inside comments

[yurivish]

This prevents characters like . from triggering the autocomplete dropdown when the user types a . inside of a comment.

docs: https://www.sublimetext.com/docs/completions.html

[FichteFoll]

Since ST4 by default includes the following for this setting, it shouldn't be necessary to override it anymore.

{"selector": "punctuation.accessor", "rhs_empty": true},