Replaced removal of plasma-runner-contacts.desktop with a proper
kwriteconfig line.

Personally I find this wrong, since akonadi is an important part of
KDE-PIM.
Fixed file parameter of kwriteconfig in previous commit.
Replaced removal of plasma-dataengine-calendar.desktop with a proper kwriteconfig line.

Again, personally I find disabling akonadi wrong.
Added comment and commented line explaining that the nepomuk krunner plugin should be disabled as well if nepomuk is disabled.

My opinion on this should be known by now ;-)