properly compute scaled_width when resizing thumbnails
properly compute scaled_width when resizing thumbnails

Bug spotted and fixed by wuda_ <wu_yuan_chun@hotmail.com>

hyperair/libgpod,neuschaefer/libgpod,hyperair/libgpod,hyperair/libgpod,neuschaefer/libgpod,hyperair/libgpod,hyperair/libgpod,neuschaefer/libgpod,neuschaefer/libgpod,neuschaefer/libgpod