Save bot accompany distance across map change or restart

If a bot is accompanying someone before map change or restart, the bot would
continue accompanying them but press up against them and orbit around them.
This is caused by the bot's formation distance being 0.

Save the formation distance so they maintain proper distance and do not
orbit around the player.

code/game/ai_main.c

@@ -1100,7 +1100,8 @@ void BotWriteSessionData(bot_state_t *bs) {
 			"%i %i %i %i %i %i %i %i"
 			" %f %f %f"
 			" %f %f %f"
-			" %f %f %f",
+			" %f %f %f"
+			" %f",
 		bs->lastgoal_decisionmaker,
 		bs->lastgoal_ltgtype,
 		bs->lastgoal_teammate,
@@ -1117,7 +1118,8 @@ void BotWriteSessionData(bot_state_t *bs) {
 		bs->lastgoal_teamgoal.mins[2],
 		bs->lastgoal_teamgoal.maxs[0],
 		bs->lastgoal_teamgoal.maxs[1],
-		bs->lastgoal_teamgoal.maxs[2]
+		bs->lastgoal_teamgoal.maxs[2],
+		bs->formation_dist
 		);
 
 	var = va( "botsession%i", bs->client );
@@ -1141,7 +1143,8 @@ void BotReadSessionData(bot_state_t *bs) {
 			"%i %i %i %i %i %i %i %i"
 			" %f %f %f"
 			" %f %f %f"
-			" %f %f %f",
+			" %f %f %f"
+			" %f",
 		&bs->lastgoal_decisionmaker,
 		&bs->lastgoal_ltgtype,
 		&bs->lastgoal_teammate,
@@ -1158,7 +1161,8 @@ void BotReadSessionData(bot_state_t *bs) {
 		&bs->lastgoal_teamgoal.mins[2],
 		&bs->lastgoal_teamgoal.maxs[0],
 		&bs->lastgoal_teamgoal.maxs[1],
-		&bs->lastgoal_teamgoal.maxs[2]
+		&bs->lastgoal_teamgoal.maxs[2],
+		&bs->formation_dist
 		);
 }