audiod: Rename handle_connect().

audiod: Rename handle_connect().

Now that it has the same signature as para_server's handle_connect(),
doxygen gets confused and complains as follows:

	audiod_command.c:359: warning: argument 'accept_fd' of command @param is not found in the argument list of handle_connect(int fd)

This is a false positive, but since "handle_connect" is not a very
descriptive name for a public function in the first place, let's
rename it.