* Fix brackets of maintainer email
The email address of the maintainer must use angle brackes as per https://www.debian.org/doc/debian-policy/ch-controlfields.html#s-f-Maintainer
Also there should be a space between name and email.
* Use variable interpolation for maintainer name
Since you already use interpolation for maintainer email you can use it for name too.
* Fix default value for maintainer
The default value for the maintainer still had the square brackets.
* Fix tests for StandardFile
The tests still used square brackets.
