Fixes for multi-node editing interactions.

1. When having 2 nodes selected, deselecting one in the ScemeTreeDock would keep the inspector in MultiNodeEdit rather than editing the one remaining node directly. This is now fixed. Closes #49451
2. In the Node3D editor, Shift-Selecting a region (drag selecting) would *deselect* nodes which were already selected, and select ones which were not, essentially inverting the selection. This is now fixed - shift-drag-selecting will only add nodes to the selection. To deselect, individual nodes can be clicked on. I am not sure if there is an issue open for this - it was a bug I found while testing other changes.
3. Other minor code cleanup.

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