mainmenu.svg: Change the referred patch.
/usr/share/icons/hicolor/scalable/places/start-here.svg
does not exist on CentOS. In order to make the theme work in EPEL, use
/usr/share/icons/hicolor/scalable/apps/start-here.svg
instead.
Signed-off-by: Zamir SUN <sztsian@gmail.com>