Lucky dev/watch can not bind to port on Linux

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After updating from v0.28 to v0.29 lucky watch and lucky dev can not bind to port 5000 even though the port is not in use.

I used lsof to verify that the port is not in use.

```
sudo lsof -i:5000
```

The error:

```
Unhandled exception: Could not bind to '127.0.0.1:5000': Address already in use (Socket::BindError)
from /home/mario/.anyenv/envs/crenv/versions/1.2.1/share/crystal/src/socket/addrinfo.cr:74:17 in 'initialize:reuse_port'
from /home/mario/.anyenv/envs/crenv/versions/1.2.1/share/crystal/src/socket/tcp_server.cr:32:3 in 'new:reuse_port'
from /home/mario/.anyenv/envs/crenv/versions/1.2.1/share/crystal/src/http/server.cr:211:5 in 'bind_tcp'
from /home/mario/.anyenv/envs/crenv/versions/1.2.1/share/crystal/src/http/server.cr:441:5 in 'listen'
from src/app_server.cr:29:5 in 'listen'
from src/start_server.cr:16:1 in '__crystal_main'
from /home/mario/.anyenv/envs/crenv/versions/1.2.1/share/crystal/src/crystal/main.cr:110:5 in 'main_user_code'
from /home/mario/.anyenv/envs/crenv/versions/1.2.1/share/crystal/src/crystal/main.cr:96:7 in 'main'
from /home/mario/.anyenv/envs/crenv/versions/1.2.1/share/crystal/src/crystal/main.cr:119:3 in 'main'
from __libc_start_main
from _start
from ???
```

Start with src/app_server.cr and src/start_server.cr, then compare the Crystal socket and HTTP server frames in the reported Linux stack trace. Reproduce with lucky dev or lucky watch on an unused port such as 5000; done means the command binds successfully when the port is free.

Written by the indexing model from the issue text.