Remove transient selection member row background
Use row activated colours on member row selection

This improves the perceived performance. Previously it would still use the default drawable until it had activated/checked the member row. This meant that there was a small delay before the colour changed. By using the sme colour for selection as activation, this delay is removed.
Merge pull request #60 from peter-tackage/deselect-member-bug

Remove setting of transient member row selection background drawables