[2319] Remove margins around the Actor image

[jerome-obeo]

Bug: #2319

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[AxelRICHARD]

It is strange that when selected, we continue to see empty spaces on the left and right sides!
Do you think we could do something about that?
I was hoping that a selected Actor has no space on left and right sides, in the same way there is no space anymore on top and bottom sides now.

[jerome-obeo]

Dimensions was given through node description provider with olds values.