[packagekit] Fix show percentage in Katja backend during download

[Sasa Ostrouska]

Hi, I made a small change to the Katja backend to show the correct
percentage during the downloading of the packages.

I believe that dividing by 2 the total tasks and have the percentage shown
when downloading up to 50% and when installing the other part from 50% up
to 100% is wrong. IMHO this should show the completing of the task and not
of all the tasks.

See the attached patch if you want to include it.

Rgds
Saxa
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