fix(layout): scroll block in with scroll mode

[yggg]

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• I read and followed the CONTRIBUTING.md guide.
• I read and followed the New Feature Checklist guide.

Short description of what this resolves:

Prevents content from widening when scroll block enabled by adding padding equal to scroll bar width.

[codecov]

Codecov Report

Merging #1805 into master will decrease coverage by 0.03%.
The diff coverage is 62.85%.

@@            Coverage Diff             @@
##           master    #1805      +/-   ##
==========================================
- Coverage   83.91%   83.88%   -0.04%     
==========================================
  Files         232      232              
  Lines        7568     7595      +27     
  Branches      665      670       +5     
==========================================
+ Hits         6351     6371      +20     
- Misses       1023     1026       +3     
- Partials      194      198       +4

Impacted Files	Coverage Δ
...mework/theme/components/layout/layout.component.ts	75% <62.85%> (-0.15%)	⬇️