stop httpServer before delete; otherwise crash at exit

Change-Id: I5993b0014215ba90623f29e84ba66c8f9a925b84
diff --git a/gui/chronosharegui.cpp b/gui/chronosharegui.cpp
index 16960b3..a829099 100644
--- a/gui/chronosharegui.cpp
+++ b/gui/chronosharegui.cpp
@@ -163,6 +163,7 @@
 
   delete m_watcher; // stop filewatching ASAP
   delete m_dispatcher; // stop dispatcher ASAP, but after watcher (to prevent triggering callbacks on deleted object)
+  m_httpServer->handle_stop();
   delete m_httpServer;
 
   // cleanup