Allow else when {...} in MandatoryBracesIfStatements rule

[schalkms]

This allows multi-line when statements following an else without requiring braces.

Fixes #3708

[codecov]

Codecov Report

Merging #3905 (9bec25a) into main (66f20e7) will decrease coverage by 0.01%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##               main    #3905      +/-   ##
============================================
- Coverage     83.55%   83.53%   -0.02%     
- Complexity     3118     3120       +2     
============================================
  Files           456      456              
  Lines          8973     8996      +23     
  Branches       1746     1753       +7     
============================================
+ Hits           7497     7515      +18     
- Misses          564      565       +1     
- Partials        912      916       +4     

Impacted Files	Coverage Δ
...ules/style/optional/MandatoryBracesIfStatements.kt	68.75% <100.00%> (+2.08%)	⬆️
...ls/src/main/kotlin/io/github/detekt/psi/KtFiles.kt	73.52% <0.00%> (-4.25%)	⬇️
...rturbosch/detekt/rules/style/UnusedPrivateClass.kt	73.33% <0.00%> (+3.33%)	⬆️

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[marschwar]

The names of both extension functions seem wrong to me. The change has not exactly made it any better ;)

[schalkms]

Thanks! Those names should really be improved.
I'll change it in a separate PR.