[MAINTAIN-122] Remove excessive space for small webforms.

[manachynskyi]

Original Issue, this PR is going to fix excessive space for small webforms for Carnation theme.

Before: https://i.imgur.com/an6E1rX.png
After: https://i.imgur.com/ffpYzqX.png

Steps for review (should be tested on Carnation)

• Create new small webform /admin/structure/webform/add with one field https://i.imgur.com/1OIGNsd.png, (e.g. https://i.imgur.com/Vv6QBD6.png)
• create new landing page -> add Webform paragraph to it -> choose created webform https://i.imgur.com/pdugyHn.png (it will be easily see empty space if you add banners right before and after webform)
• visit page and make sure there no empty space before and after webform

[gundevel]

Can one of the admins verify this patch? Use "o+k to test" or ''t+est this please" for manual build execution.

[podarok]

@manachynskyi I've merged a fix for scss paths. Could you remove DO_NOT_MERGE tag from this?

[hamrant]

ok to test

[gundevel]

Build comment file:

Check Open Y Installation Wizard at http://install.openy.cibox.tools/build3504/install.php

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Test PASSed.
Refer to this link for build results (access rights to CI server needed):
http://openy.cibox.tools:8080/job/PR_BUILDER_COMPOSER/3504/

[gundevel]

Open Y Upgrade Path site check installed at http://upgrade.openy.cibox.tools/build3504/

[podarok]

Code looks good