Remove deprecated calculateLineColByOffset methods from Ktlint

[kentr0w]

What's done:

Copy-paste methods
closes #386

[codecov]

Codecov Report

Merging #394 into master will increase coverage by 0.01%.
The diff coverage is 86.36%.

@@             Coverage Diff              @@
##             master     #394      +/-   ##
============================================
+ Coverage     82.69%   82.71%   +0.01%     
  Complexity     1359     1359              
============================================
  Files            65       66       +1     
  Lines          3364     3401      +37     
  Branches       1070     1078       +8     
============================================
+ Hits           2782     2813      +31     
- Misses          171      172       +1     
- Partials        411      416       +5     

Flag	Coverage Δ	Complexity Δ
#unittests	82.71% <86.36%> (+0.01%)	1359.00 <0.00> (ø)

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Impacted Files	Coverage Δ	Complexity Δ
...cqfn/diktat/ruleset/utils/PositionInTextLocator.kt	83.33% <83.33%> (ø)	0.00 <0.00> (?)
...kotlin/org/cqfn/diktat/ruleset/rules/LineLength.kt	84.15% <100.00%> (ø)	75.00 <0.00> (ø)
...tlin/org/cqfn/diktat/ruleset/utils/AstNodeUtils.kt	82.15% <100.00%> (+0.08%)	0.00 <0.00> (ø)

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