WRONG_INDENTATION: fix the regression introduced with 998d0e9

[0x6675636b796f75676974687562]

What's done:

• Fixes the false-positive warnings reported for single-line string templates.
• Closes WRONG_INDENTATION false-positive: "the same number of indents to the opening and closing quotes was expected" #1490.
• See Changing indentation of multiline string works incorrect #811 (the original feature request).
• See Bugfix/indentation of multiline string #1364 (the pull request which introduced the regression).
• See 998d0e9 (the commit which introduced the regression).

[codecov]

Codecov Report

Merging #1503 (1c8534a) into master (ce65178) will decrease coverage by 0.04%.
The diff coverage is 72.41%.

@@             Coverage Diff              @@
##             master    #1503      +/-   ##
============================================
- Coverage     82.80%   82.76%   -0.05%     
+ Complexity     2573     2565       -8     
============================================
  Files           111      111              
  Lines          7712     7723      +11     
  Branches       2114     2121       +7     
============================================
+ Hits           6386     6392       +6     
  Misses          432      432              
- Partials        894      899       +5     

Flag	Coverage Δ
unittests	82.76% <72.41%> (-0.05%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...at/ruleset/rules/chapter3/files/IndentationRule.kt	75.00% <72.41%> (-0.88%)	⬇️

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