Fix #609: make behavior more consistent on request verify token

Now, it always returns 202 even if the user is already verified

fastapi_users/router/verify.py

@@ -36,12 +36,7 @@ def get_verify_router(
     ):
         try:
             user = await get_user(email)
-            if user.is_verified:
-                raise HTTPException(
-                    status_code=status.HTTP_400_BAD_REQUEST,
-                    detail=ErrorCode.VERIFY_USER_ALREADY_VERIFIED,
-                )
-            elif user.is_active:
+            if not user.is_verified and user.is_active:
                 token_data = {
                     "user_id": str(user.id),
                     "email": email,