grass.desktop: no absolute path to the icon; fixes https://bugzilla.redhat.com/show_bug.cgi?id=986852; following http://standards.freedesktop.org/desktop-entry-spec/desktop-entry-spec-latest.html#extra-actions-keys

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@59240 15284696-431f-4ddb-bdfa-cd5b030d7da7

gui/icons/grass.desktop

@@ -48,5 +48,5 @@ Comment[uk]=Геоінформаційна система
 Comment[uz]=Geografik axborot tizimi
 Categories=Education;Science;Geoscience;Geography;
 Exec=grass7
-Icon=/usr/share/icons/grass-48x48.png
+Icon=grass
 Terminal=true