Change kill-this-buffer to kill-current-buffer

[smithzvk]

Change "q" key binding from kill-this-buffer to kill-current-buffer

Description

From the docs regarding 'kill-this-buffer':

This command must be bound to a mouse event, and can be reliably invoked only from the menu bar, otherwise it could decide to silently do nothing or signal an error. Use ‘kill-current-buffer’ if you need to invoke a similar command from keyboard.

Related Issue

N/A

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• Improvement (non-breaking change which improves an existing feature)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• I have read the CONTRIBUTING.md document.
• I have updated the documentation in the README.md file if necessary.
• I have added an entry to CHANGES.md.
• I have added tests to cover my changes.
• All new and existing tests passed (using make test).