Format uid string correctly when creating keys.

Correct format :
	name <email> (comment)
Was :
	name <email> comment

Though the 'comment' part was visible with the cli gpg app, it was not
shown in kleopatra and in K7.

GpgMEWorker.h

@@ -159,6 +159,9 @@ private:
     Context * m_ctx;
     // GPG will fetch a password here.
     LoopbackPassphraseProvider * m_ppp;
+
+    string MakeUidString(const string& name, const string& email,
+                         const string& comment);
 };
 
 /**