FP for gradle script

[kentr0w]

What's done:

• Fixed logic in RunScriptRule
• Removed handler for header in gradle script
• Closes FP for gradle scripts #834

[codecov]

Codecov Report

Merging #885 (b9f24e8) into master (14d97a3) will increase coverage by 0.10%.
The diff coverage is 95.00%.

@@             Coverage Diff              @@
##             master     #885      +/-   ##
============================================
+ Coverage     83.94%   84.05%   +0.10%     
- Complexity     2308     2311       +3     
============================================
  Files           100      100              
  Lines          5893     5894       +1     
  Branches       1739     1742       +3     
============================================
+ Hits           4947     4954       +7     
+ Misses          261      255       -6     
  Partials        685      685              

Flag	Coverage Δ	Complexity Δ
unittests	84.05% <95.00%> (+0.10%)	2311.00 <10.00> (+3.00)

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Impacted Files	Coverage Δ	Complexity Δ
.../cqfn/diktat/ruleset/rules/chapter6/RunInScript.kt	92.30% <93.33%> (+19.89%)	16.00 <6.00> (+2.00)
...leset/rules/chapter2/comments/HeaderCommentRule.kt	86.59% <100.00%> (ø)	46.00 <4.00> (+1.00)
...tlin/org/cqfn/diktat/ruleset/utils/AstNodeUtils.kt	85.77% <100.00%> (+0.22%)	0.00 <0.00> (ø)

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