Fix exec icon location and bring it into XDG compliance

diff --git a/konq-plugins/kuick/kdirmenu.cpp b/konq-plugins/kuick/kdirmenu.cpp
index 984326d..35fe9c8 100644
--- a/konq-plugins/kuick/kdirmenu.cpp
+++ b/konq-plugins/kuick/kdirmenu.cpp
@@ -155,7 +155,7 @@
     _icons->insert("kfm", SmallIcon("kfm"));
     _icons->insert("terminal", SmallIcon("terminal"));
     _icons->insert("txt", SmallIcon("text-plain"));
-    _icons->insert("exec", SmallIcon("exec"));
+    _icons->insert("exec", SmallIcon("application-x-executable"));
     _icons->insert("chardevice", SmallIcon("chardevice"));
 }
 void KDirMenu::slotFileSelected(const TQString &_path ){