feat(bots/discord): support training without label

bots/discord/config.schema.ts

@@ -36,7 +36,6 @@ export type Config = {
             blacklist?: Filter
         }
         humanCorrections: {
-            falsePositiveLabel: string
             allow?: {
                 users?: string[]
                 members?: {
@@ -72,7 +71,7 @@ export type ConfigMessageScanResponse = {
         image?: Array<RegExp>
     }
     filterOverride?: NonNullable<Config['messageScan']>['filter']
-    response: ConfigMessageScanResponseMessage | null
+    response: ConfigMessageScanResponseMessage
     respondToReply?: boolean
 }