Fix a regression when multiple nodes are selected and drag transform is attempted w/o gizmo #87922
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#87769 fixes a regression but introduces another. I misunderstood
get_single_selected_node
and thought it would still return a node if multiple were selected node, but it actually returns false and ends up breaking transforms done via dragging outside the gizmo. This PR replaces that method with a check if more than 0 nodes are selected.