gui: only log errors

VECTO/app.config

@@ -18,7 +18,7 @@
 		</targets>
 		<rules>
 			<logger name="*" minlevel="Warn" writeTo="LogFile" />
-			<logger name="*" minlevel="Warn" writeTo="WarningLogger" />
+			<logger name="*" minlevel="Error" writeTo="WarningLogger" />
 		</rules>
 	</nlog>
 	<system.diagnostics>