Merge pull request scp-fs2open#7037 from Goober5000/save_fix

fix load/save mismatch in missions

Author: Goober5000

code/mission/missionparse.cpp

@@ -804,15 +804,15 @@ void parse_mission_info(mission *pm, bool basic = false)
 		stuff_float(&Neb2_fog_far_mult);
 	}
 
-	if (optional_string("+Volumetric Nebula:")) {
-		pm->volumetrics.emplace().parse_volumetric_nebula();
-	}
-
 	// Goober5000 - ship contrail speed threshold
 	if (optional_string("$Contrail Speed Threshold:")){
 		stuff_int(&pm->contrail_threshold);
 	}
 
+	if (optional_string("+Volumetric Nebula:")) {
+		pm->volumetrics.emplace().parse_volumetric_nebula();
+	}
+
 	// get the number of players if in a multiplayer mission
 	if ( pm->game_type & MISSION_TYPE_MULTI ) {
 		if ( optional_string("+Num Players:") ) {