Remove sibling selectors before check if class is used on page

[agubler]

Type: bug

The following has been addressed in the PR:

• There is a related issue
• All code has been formatted with prettier as per the readme code style guidelines
• Unit or Functional tests are included in the PR

Description:

Selectors using ~ or + are not added to the BTR output even if the page uses the class. This change removes + and ~ before checking against the pages classes.

[codecov]

Codecov Report

Merging #342 (c8e7c89) into master (a6dcaf4) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #342   +/-   ##
=======================================
  Coverage   85.52%   85.52%           
=======================================
  Files          54       54           
  Lines        2618     2618           
  Branches      715      715           
=======================================
  Hits         2239     2239           
  Misses        379      379           

Impacted Files	Coverage Δ
src/build-time-render/BuildTimeRender.ts	93.78% <ø> (ø)

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