[pvr.vdr.vnsi] Fix segfault when showing scan dialog if VDR is not connected

If vdr fails to read countries, then m_spinSatellites is never initialized.
Easily fixed by a proper initialization list.
Merge pull request #299 from garbear/fix-crash

[pvr.vdr.vnsi] Fix segfault when showing scan dialog if VDR is not connected
VNSI: add icon path to channels
VNSI: bump max size of timeshift buffer ram
squash icon path