Remove deprecated/useless entries causing validation warnings.

--- kpovmodeler.desktop
+++ kpovmodeler.desktop
@@ -49,12 +49,8 @@
 GenericName[tr]=Povray Modelleyici
 GenericName[x-test]=xxPovray Modelerxx
 GenericName[zh_HK]=Povray 建模器
-Path=
 ServiceTypes=KParts/ReadOnlyPart,KParts/ReadWritePart,Browser/View,KPovModeler/Document
-SwallowExec=
-SwallowTitle=
 Terminal=false
 Type=Application
 X-KDE-Library=libkpovmodelerpart
 Categories=Qt;KDE;Graphics;
-Encoding=UTF-8