EXT-8275 FIXED (Build > Group > Edit Group - Replace checkbox with new Edit...

EXT-8275 FIXED (Build > Group > Edit Group - Replace checkbox with new Edit icon, and move to the right of group name)

- Connected callback that closes Group Floater when object selection changes

Reviewed by Mike Antipov at https://codereview.productengine.com/secondlife/r/739/

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branch : product-engine