Fix exec icon location and bring it into XDG compliance

diff --git a/src/gui/newfiledlg.cpp b/src/gui/newfiledlg.cpp
index 50af44b..09c0784 100644
--- a/src/gui/newfiledlg.cpp
+++ b/src/gui/newfiledlg.cpp
@@ -52,7 +52,7 @@
 	items << new TQIconViewItem(m_pNewFileWidget->typeIconView,"Circuit (.circuit)", loader->loadIcon( "ktechlab_circuit", TDEIcon::NoGroup, TDEIcon::SizeHuge ) );
 	items << new TQIconViewItem(m_pNewFileWidget->typeIconView,"FlowCode (.flowcode)", loader->loadIcon( "ktechlab_flowcode", TDEIcon::NoGroup, TDEIcon::SizeHuge ) );
 #ifdef MECHANICS
-	items << new TQIconViewItem(m_pNewFileWidget->typeIconView,"Mechanics (.mechanics)", loader->loadIcon( "exec", TDEIcon::NoGroup, TDEIcon::SizeHuge ) );
+	items << new TQIconViewItem(m_pNewFileWidget->typeIconView,"Mechanics (.mechanics)", loader->loadIcon( "application-x-executable", TDEIcon::NoGroup, TDEIcon::SizeHuge ) );
 #endif
 	items << new TQIconViewItem(m_pNewFileWidget->typeIconView,"Microbe (.microbe)", loader->loadIcon( "ktechlab_microbe", TDEIcon::NoGroup, TDEIcon::SizeHuge ) );