[patch] bugfix for saving in network mode
The savegame-frame calls karte_t::reset_timer(), which resets last_step_ticks. This leads to loss of synchronisation.
The patch simply checks whether we are in step mode FIX_RATIO, and does not reset last_step_ticks then.
Any comments appreciated, as I do not know other implications of this patch. Imho, it should not break that much, since this variable is reset upon loading/creating new world anyway.