comment should start at the beginning of the line

## Description of the problem or steps to reproduce
when using the comment plugin, the comment character should be at the beginning of the line and not in front of the first word, this way it is more readable what is commented.

## Specifications
Micro version: 2.0.10
Commit hash: b9763856
OS: Arch
comment plugin version: 1.0.0
Terminal: Tilix 1.9.4
