Fix app launch

[0pcom]

The bin path set in the config was not being obbserved by the visor when launching apps, causing the following error

[2024-03-19T15:11:32.994167031-05:00] WARN AutoStart [launcher]: Failed to start app. app_name="skychat" args=[app skychat --addr :8001] envs=[] error="fork/exec /home/user/go/src/github.com/skycoin/skywire: permission denied"
[2024-03-19T15:11:32.996215014-05:00] WARN AutoStart [launcher]: Failed to start app. app_name="skysocks" args=[app skysocks] envs=[] error="fork/exec /home/user/go/src/github.com/skycoin/skywire: permission denied"

This was addressed, and the Makefile was updated to only build the unified / united binary

[0pcom]

[2024-03-19T15:41:48.869314101-05:00] INFO [proc:skychat:ae8dccb462e14cf48bf72bff258fa8b6]: App skychat is Running
[2024-03-19T15:41:48.870620843-05:00] INFO [proc:skysocks:7b86c536efd84941aec31178a10eb8f0]: App skysocks is Running

tested, working.