10_SD_GT revised for perlcritic

[elektron-bbs]

• Please check if the PR fulfills these requirements

• Tests for the changes have been added / modified (needed for for bug fixes / features)
• commandref has been added / updated (needed for bug fixes / features)
• CHANGED has been updated (needed for bug fixes / features)

• What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)
  Revision

• What is the current behavior? (You can also link to an open issue here)
  OK

• What is the new behavior (if this is a feature change)?
  no functional change

• Does this PR introduce a breaking change? (What changes might users need to make in their application due to this PR?)
  no

• Other information:

[coveralls]

Pull Request Test Coverage Report for Build 3378

• 11 of 121 (9.09%) changed or added relevant lines in 1 file are covered.
• 4 unchanged lines in 1 file lost coverage.
• Overall coverage decreased (-0.1%) to 53.795%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
FHEM/10_SD_GT.pm	11	121	9.09%

Files with Coverage Reduction	New Missed Lines	%
FHEM/10_SD_GT.pm	4	5.91%

Totals
Change from base Build 3373:	-0.1%
Covered Lines:	3310
Relevant Lines:	6153

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💛 - Coveralls