F53OSCClient: remove redundant `socket` check in `sendPacket:`
F53OSCClient: remove redundant `socket` check in `sendPacket:`

- `connect` already checks for nil `socket`
- Fixes a bug that prevented a TCP client from re-establishing a connection after the receiving end of a TCP connection disconnects, because only `destroySocket` unsets the socket

Figure53/F53OSC,Figure53/F53OSC,Figure53/F53OSC