bugfix: red-ish highlighting for outdated packages

on mouseover/hover actions, the elements appeared blue-ish and selected elements were still blue in the package list. they are now as red as they should be

Signed-off-by: Dominik Richter <dominik.richter@gmail.com>
improvement: extend coloring if some packages are outdated

the package list only supported background coloring so far. now it does the same as the regular outdated coloring with hover and selection just in a yellow-ish tone for some outdated packages

Signed-off-by: Dominik Richter <dominik.richter@gmail.com>
Merge pull request #41 from TelekomCloud/bugfix/outdated-highlighting

bugfix: outdated highlighting