Include moc file again in revoke cert command

This is needed on Windows at least, otherwise we have
an undefined vtable for this class.

src/commands/revokecertificationcommand.cpp

@@ -355,3 +355,5 @@ void RevokeCertificationCommand::doCancel()
 
 #undef d
 #undef q
+
+#include "moc_revokecertificationcommand.cpp"