Fix switch case not being included correctly

[lukastaegert]

This PR contains:

• bugfix
• feature
• refactor
• documentation
• other

Are tests included?

• yes (bugfixes and features will not be merged without tests)
• no

Breaking Changes?

• yes (breaking changes will not be merged unless absolutely necessary)
• no

List any relevant issue numbers:
Resolves #3177

Description

This fixes a very peculiar situation where since during the first tree-shaking run, no case of a switch statement that had a default was included, the logic assumed that the control flow was broken and included no further statements after the switch, even though those would have caused the switch to have a side-effect.

[codecov]

Codecov Report

Merging #3178 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master   #3178      +/-   ##
=========================================
+ Coverage    90.2%   90.2%   +<.01%     
=========================================
  Files         165     165              
  Lines        5909    5910       +1     
  Branches     1799    1800       +1     
=========================================
+ Hits         5330    5331       +1     
  Misses        350     350              
  Partials      229     229

Impacted Files	Coverage Δ
src/ast/nodes/SwitchStatement.ts	100% <100%> (ø)	⬆️

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