Function is not being simplified to expression body when semicolon is present

[kentr0w]

What's done:

Fixed bug
closes #477

[codecov]

Codecov Report

Merging #557 (0e446fe) into master (052bd9d) will increase coverage by 0.00%.
The diff coverage is 90.00%.

@@            Coverage Diff            @@
##             master     #557   +/-   ##
=========================================
  Coverage     81.68%   81.69%           
- Complexity     1641     1665   +24     
=========================================
  Files            79       83    +4     
  Lines          4139     4211   +72     
  Branches       1307     1315    +8     
=========================================
+ Hits           3381     3440   +59     
- Misses          229      238    +9     
- Partials        529      533    +4     

Flag	Coverage Δ	Complexity Δ
unittests	81.69% <90.00%> (+<0.01%)	0.00 <7.00> (ø)

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

Impacted Files	Coverage Δ	Complexity Δ
...at-rules/src/main/kotlin/generated/WarningNames.kt	0.00% <ø> (ø)	0.00 <0.00> (ø)
...lin/org/cqfn/diktat/ruleset/rules/PackageNaming.kt	93.75% <33.33%> (-1.19%)	32.00 <0.00> (ø)
...cqfn/diktat/ruleset/rules/DiktatRuleSetProvider.kt	97.26% <100.00%> (ø)	8.00 <0.00> (ø)
...qfn/diktat/ruleset/rules/classes/SingleInitRule.kt	78.46% <100.00%> (+0.68%)	16.00 <0.00> (+6.00)
.../cqfn/diktat/ruleset/rules/files/BlankLinesRule.kt	100.00% <100.00%> (ø)	13.00 <7.00> (+1.00)
...rg/cqfn/diktat/ruleset/rules/files/NewlinesRule.kt	83.95% <100.00%> (+0.17%)	110.00 <0.00> (+6.00)
...g/cqfn/diktat/ruleset/rules/kdoc/KdocFormatting.kt	77.12% <100.00%> (-0.15%)	73.00 <0.00> (ø)
...tlin/org/cqfn/diktat/ruleset/utils/ASTConstants.kt	100.00% <100.00%> (ø)	0.00 <0.00> (ø)
...qfn/diktat/plugin/gradle/DiktatJavaExecTaskBase.kt	79.31% <0.00%> (ø)	5.00% <0.00%> (?%)
...n/org/cqfn/diktat/plugin/gradle/DiktatExtension.kt	100.00% <0.00%> (ø)	4.00% <0.00%> (?%)
... and 2 more

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