Fix options rendering in APTConfigLine breaking its output

[mickael-carl]

Without that added space, the line generated is actually invalid. Take for instance Docker's apt repository: parsing its apt config line deb [signed-by=/etc/apt/keyrings/docker.asc] https://download.docker.com/linux/debian bookworm stable will yield a well-formed repository. However, re-generating the line with APTConfigLine from that Repository will yield deb [signed-by=/etc/apt/keyrings/docker.asc]https://download.docker.com/linux/debian bookworm stable (note the missing space). This will result in errors such as:

Error: Malformed entry 1 in list file /etc/apt/sources.list.d/stable.list ([option] not assignment)
Error: The list of sources could not be read.

[mickael-carl]

@per1234 given that this is a bug, would you be open to review this PR? I suspect the other enhancements I've opened can wait but without this fix I think any repository addition with an option actually breaks.
Moving forward, I'm happy to step in and help maintain this repository further if you're looking for additional maintainers.

[per1234]

Hi @mickael-carl. Thanks so much for your contributions, and for your offer to assist in the maintenance!

I only act in a janitorial role in this project, without any involvement in the development. So unfortunately I am not able to provide code reviews, merge PRs, or make decisions regarding project management.

[mickael-carl]

@per1234 thanks for the quick response! Would you happen to know who I could contact for assistance?

[mickael-carl]

@cmaglie maybe?

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