remove empty jail.go file that was causing test failures

The empty jail.go file was causing Go tests to fail with:
'expected 'package', found 'EOF''

Removed the 0-byte file to fix test execution.
All tests now pass and build continues to work.

Fixes test failures in the root package.

Co-authored-by: f0ssel <[email protected]>

Author: blink-so[bot]