Move fpm listen for easier config override

[yosifkit]

https://github.com/docker-library/php/issues/1564#issuecomment-2623026468:

We need to make sure daemonize = no is as late as possible, but listen = 9000 could be higher

This should make it easier to override the listen directive. I don't think this is breaking, but there is still probably someone relying on listen being later rather than earlier (like if they delete/replace the whole docker.conf). So, this can wait until after the new year. Or maybe I can gate this to only apply to the next release of each PHP version.

Fixes https://github.com/docker-library/php/issues/1564