fix(tapd): fix custom fields for task and story models
diff --git a/backend/plugins/tapd/models/story.go b/backend/plugins/tapd/models/story.go
index 79e7140..006c667 100644
--- a/backend/plugins/tapd/models/story.go
+++ b/backend/plugins/tapd/models/story.go
@@ -82,9 +82,9 @@
 	CustomFieldThree string `json:"custom_field_three" gorm:"type:text"`
 	CustomFieldFour  string `json:"custom_field_four" gorm:"type:text"`
 	CustomFieldFive  string `json:"custom_field_five" gorm:"type:text"`
-	CustomField6     string `json:"custom_field_six" gorm:"type:text"`
-	CustomField7     string `json:"custom_field_seven" gorm:"type:text"`
-	CustomField8     string `json:"custom_field_eight" gorm:"type:text"`
+	CustomFieldSix   string `json:"custom_field_six" gorm:"type:text"`
+	CustomFieldSeven string `json:"custom_field_seven" gorm:"type:text"`
+	CustomFieldEight string `json:"custom_field_eight" gorm:"type:text"`
 	CustomField9     string `json:"custom_field_9" gorm:"type:text;column:custom_field_9"`
 	CustomField10    string `json:"custom_field_10" gorm:"type:text;column:custom_field_10"`
 	CustomField11    string `json:"custom_field_11" gorm:"type:text;column:custom_field_11"`
diff --git a/backend/plugins/tapd/models/task.go b/backend/plugins/tapd/models/task.go
index bd9f708..7b59791 100644
--- a/backend/plugins/tapd/models/task.go
+++ b/backend/plugins/tapd/models/task.go
@@ -64,9 +64,9 @@
 	CustomFieldThree string `json:"custom_field_three" gorm:"type:text"`
 	CustomFieldFour  string `json:"custom_field_four" gorm:"type:text"`
 	CustomFieldFive  string `json:"custom_field_five" gorm:"type:text"`
-	CustomField6     string `json:"custom_field_six" gorm:"type:text"`
-	CustomField7     string `json:"custom_field_seven" gorm:"type:text"`
-	CustomField8     string `json:"custom_field_eight" gorm:"type:text"`
+	CustomFieldSix   string `json:"custom_field_six" gorm:"type:text"`
+	CustomFieldSeven string `json:"custom_field_seven" gorm:"type:text"`
+	CustomFieldEight string `json:"custom_field_eight" gorm:"type:text"`
 	CustomField9     string `json:"custom_field_9" gorm:"type:text;column:custom_field_9"`
 	CustomField10    string `json:"custom_field_10" gorm:"type:text;column:custom_field_10"`
 	CustomField11    string `json:"custom_field_11" gorm:"type:text;column:custom_field_11"`