kcm: Simplify Add Connection dialog

Nate Grahamrequested to merge
work/ngraham/simpler-add-connection-ui into master

A two-fer:

kcm: Simplify Add Connection dialog

We can activate items on single-click; there's nothing to do with a selected list item, so double-click doesn't make sense. This lets us remove the footer which is now full of redundant items. The result is a simpler and more normal listview UI.

BUG: 507784
BUG: 507785
FIXED-IN: 6.5.0

kcm: Highlight Add Connection list item when pressed or selected

Before After
Before After

@teams/vdg @teams/usability

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