fix(cli): ensure host is set when starting dev server

[tido64]

Description

Ensure host is set to localhost by default when starting the dev server,
otherwise it will listen to external connections.

Test plan

Start the dev server in packages/test-app/, then run the following command:

% lsof -i -P | grep -i "8081"
node      14144 tido   18u  IPv4 0xf937265a3b363f23      0t0  TCP localhost:8081 (LISTEN)

• Verify that the address is localhost:8081 and not *:8081.
• Verify that the bundle is served: curl -v 'http://localhost:8081/index.bundle?platform=ios' &> /dev/null