[fix] 팜클럽 완료 시 -1 조건 추가

src/main/java/com/modernfarmer/farmusspring/domain/myveggiegarden/service/MyVeggieGardenService.java

@@ -107,7 +107,7 @@ public void successFarming(SuccessFarmingRequestDto requestDto, MultipartFile im
     }
 
     public int checkFarmClubAffiliation(MyVeggie myVeggie){
-        if(myVeggie.getUserFarmClub() == null)
+        if(myVeggie.getUserFarmClub() == null || myVeggie.getUserFarmClub().isComplete())
             return -1;
         return myVeggie.getUserFarmClub().getCurrentStep();
     }