Make current line number disappear on the left (for Absolute + Relative)

When using `Absolute + Relative`, currently, it looks like this:

![image](https://github.com/slhsxcmy/vscode-double-line-numbers/assets/128335079/bc9ca3b0-8eac-444f-9649-9afa3b15ca93)

Would be nice to have the absolute line number (on the left) disappear:

![image](https://github.com/slhsxcmy/vscode-double-line-numbers/assets/128335079/79a0793c-152e-4df8-96ed-c2a551957e22)
