Fix of  doubled end of round, when spectator changes mode to active, sho...

...rt of the new round start.

This is fix of  https://github.com/assaultcube/AC/issues/18 . Patch restores structure changed in commit: https://github.com/assaultcube/AC/commit/5c117d .
There is added only "c.state.state==CS_SPECTATE" condition.