fix runtime service

Author: saehejkang

Sources/Services/RuntimeLinux/Server/RuntimeService.swift

@@ -784,7 +784,7 @@ public actor RuntimeService {
         self.log.info("`clean` xpc handler")
         switch self.state {
         case .running:
-            guard let id = message.string(key: RuntimeKeys.id.rawValue) else {
+            guard message.string(key: RuntimeKeys.id.rawValue) != nil else {
                 throw ContainerizationError(
                     .invalidArgument,
                     message: "no id supplied for clean"