fix: recruiting enum type (#94)

* Recruiting type을 prod와 맞춰주었습니다.

Author: mjy926

wacruit/src/apps/common/enums.py

@@ -64,9 +64,9 @@ class CodeSubmissionResultStatus(Enum):
 
 
 class RecruitingType(Enum):
-    ROOKIE = "ROOKIE"
-    DESIGNER = "DESIGNER"
-    PROGRAMMER = "PROGRAMMER"
+    ROOKIE = 1
+    DESIGNER = 2
+    PROGRAMMER = 3
 
 
 class RecruitingApplicationStatus(Enum):