Axivion: Add state filter handling

Contrary to the web dashboard selecting a filter means explicitly
enabling this instead of disabling.
May change later with other UI improvements.

Change-Id: I83b32464a6d9bdab03dce78587962960900af08b
Reviewed-by: Jarek Kobus <jaroslaw.kobus@qt.io>

src/plugins/axivion/axivionplugin.cpp

@@ -122,6 +122,8 @@ QString IssueListSearch::toQuery() const
         result.append(QString("&filter_path=%1").arg(
             QString::fromUtf8(QUrl::toPercentEncoding(filter_path))));
     }
+    if (!state.isEmpty())
+        result.append(QString("&state=%1").arg(state));
     if (computeTotalRowCount)
         result.append("&computeTotalRowCount=true");
     return result;