Fix problem with i2pd service

[ChernovHere]

My case:

When changing the address of the web interface or http/socks proxy to 192.168.X.X and after restarting the system, an error pops up:

XX:XX:XX:XX@365/critical - Daemon: Failed to start Webconsole: bind: Cannot assign requested address
XX:XX:XX:XX@365/critical - Clients: Exception in HTTP Proxy: bind: Cannot assign requested address
XX:XX:XX:XX@365/critical - Clients: Exception in SOCKS Proxy: bind: Cannot assign requested address

This PR fixes the problem

[r4sas]

Может в Wants оставить network.target?

Wants=network.target
After=network.target network-online.target

[r4sas]

Да и вообще, если у тебя инет не появится, то у тебя никогда до network-online не дойдет. По этому двуякая ситуация может выйти.