ecore_con: Server start time was not initialized correctly

ecore_con: Server start time was not initialized correctly

ecore_con_event_server_add() is never called (at least not in the
standard TCP connection case, so initialize svr->start_time in
ecore_con_server_add(). This shouldn't regress any other behaviour as
this is done at the very beginning and any later change to start_time
will still happen.

Signed-off-by: Daniel Willmann <d.willmann@samsung.com>