Fix forward declaration

core/mail/exportmailfolderattributejob.h

@@ -7,7 +7,6 @@
 #include "importexportmailutil.h"
 #include "pimdataexportercore_private_export.h"
 #include <QObject>
-class KJob;
 class KZip;
 class ExportMailJobInterface;
 class PIMDATAEXPORTER_TESTS_EXPORT ExportMailFolderAttributeJob : public QObject

core/mail/exportmailfolderattributejobimpl.h

@@ -7,7 +7,7 @@
 #pragma once
 
 #include "exportmailfolderattributejob.h"
-
+class KJob;
 class ExportMailFolderAttributeJobImpl : public ExportMailFolderAttributeJob
 {
     Q_OBJECT