Fixes cooking value not updating properly (#6605)

* Fixes #6602.
* Resolves cooking items only updating the player's cooking variable and not properly updating the player's session data along with it.
Thanks to @Shaktohh and @Lemongrass3110!

src/map/pc.cpp

@@ -9867,8 +9867,6 @@ bool pc_setparam(struct map_session_data *sd,int64 type,int64 val_tmp)
 		pc_setglobalreg(sd, add_str(PCDIECOUNTER_VAR), sd->die_counter);
 		return true;
 	case SP_COOKMASTERY:
-		if (val < 0)
-			return false;
 		if (sd->cook_mastery == val)
 			return true;
 		val = cap_value(val, 0, 1999);

src/map/skill.cpp

@@ -21832,8 +21832,7 @@ bool skill_produce_mix(struct map_session_data *sd, uint16 skill_id, t_itemid na
 				default: //Those that don't require a skill?
 					if (skill_produce_db[idx].itemlv > 10 && skill_produce_db[idx].itemlv <= 20) { //Cooking items.
 						clif_specialeffect(&sd->bl, EF_COOKING_OK, AREA);
-						if (sd->cook_mastery < 1999)
-							pc_setglobalreg(sd, add_str(COOKMASTERY_VAR), sd->cook_mastery + ( 1 << ( (skill_produce_db[idx].itemlv - 11) / 2 ) ) * 5);
+						pc_setparam(sd, SP_COOKMASTERY, sd->cook_mastery + ( 1 << ( (skill_produce_db[idx].itemlv - 11) / 2 ) ) * 5);
 					}
 					break;
 			}
@@ -21987,8 +21986,7 @@ bool skill_produce_mix(struct map_session_data *sd, uint16 skill_id, t_itemid na
 			default:
 				if (skill_produce_db[idx].itemlv > 10 && skill_produce_db[idx].itemlv <= 20 ) { //Cooking items.
 					clif_specialeffect(&sd->bl, EF_COOKING_FAIL, AREA);
-					if (sd->cook_mastery > 0)
-						pc_setglobalreg(sd, add_str(COOKMASTERY_VAR), sd->cook_mastery - ( 1 << ((skill_produce_db[idx].itemlv - 11) / 2) ) - ( ( ( 1 << ((skill_produce_db[idx].itemlv - 11) / 2) ) >> 1 ) * 3 ));
+					pc_setparam(sd, SP_COOKMASTERY, sd->cook_mastery - ( 1 << ((skill_produce_db[idx].itemlv - 11) / 2) ) - ( ( ( 1 << ((skill_produce_db[idx].itemlv - 11) / 2) ) >> 1 ) * 3 ));
 				}
 				break;
 		}