fix(cdk/overlay): fix overlay margin in isBoundedByLeftViewportEdge

[kryshac]

When the overlay is opening 'left-ward' (the content flows to the left) the margin is not calculated correctly because the margin is subtracted twice from the width (line: 1092), but here it is added only once

[jelbourn]

I'm not sure if this is the desired behavior? It's been a long time since I wrote this, but I think that we'd want to keep it such that the rightmost edge of the bounding box is the actual viewport edge minus one margin, no?

[kryshac]

because I have a margin in the viewport, the overlay goes to the right, exactly as much as the margin is set

[kryshac]

and also the same behavior is implemented when calculating the bottom line 772

[jelbourn]

LGTM, understood

[kryshac]

@jelbourn @mmalerba hello, what is happening with this pull request?

[GiorgiZanqaidze]

..

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