TrimMultilineRawString: fix false positive with not a raw string

[t-kameyama]

Fixes #5428

[codecov]

Codecov Report

Merging #5438 (99ac92e) into main (8951ab8) will decrease coverage by 0.04%.
The diff coverage is 57.14%.

@@             Coverage Diff              @@
##               main    #5438      +/-   ##
============================================
- Coverage     85.99%   85.95%   -0.05%     
  Complexity     3614     3614              
============================================
  Files           514      514              
  Lines         12056    12057       +1     
  Branches       2162     2163       +1     
============================================
- Hits          10368    10364       -4     
- Misses          617      618       +1     
- Partials       1071     1075       +4     

Impacted Files	Coverage Δ
...bosch/detekt/rules/style/TrimMultilineRawString.kt	84.00% <57.14%> (-7.67%)	⬇️
...tlab/arturbosch/detekt/core/reporting/Colorizer.kt	78.57% <0.00%> (-21.43%)	⬇️

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