[pgAdmin4][Patch]: Improvise the treeview element selection

[Surinder Kumar]

Hi All,

Changes:

1. Highlight the full selected tree item instead of highlighting only label.
2. Set selected item background color to dark blue that is more visible to
eyes.[same as in pgAdmin3]

Please find attached patch and review.

Thanks,
Surinder

change_acitree_style.patch
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