SqlServerDsc: Fix hashtables to align with style guideline

[johlju]

Pull Request (PR) description

• Changes to SqlServerDsc
  • Fix hashtables to align with style guideline (issue SqlServerDsc: Resolve style guideline violations for hashtables #1437).

This Pull Request (PR) fixes the following issues

• Fixes SqlServerDsc: Resolve style guideline violations for hashtables #1437

Task list

• Added an entry under the Unreleased section of the change log in the CHANGELOG.md.
  Entry should say what was changed, and how that affects users (if applicable).
• Resource documentation added/updated in README.md.
• Resource parameter descriptions added/updated in README.md, schema.mof
  and comment-based help.
• Comment-based help added/updated.
• Localization strings added/updated in all localization files as appropriate.
• Examples appropriately added/updated.
• Unit tests added/updated. See DSC Resource Testing Guidelines.
• Integration tests added/updated (where possible). See DSC Resource Testing Guidelines.
• New/changed code adheres to DSC Resource Style Guidelines and Best Practices.

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This change is 

[codecov-io]

Codecov Report

Merging #1440 into dev will decrease coverage by <1%.
The diff coverage is 98%.

@@         Coverage Diff          @@
##            dev   #1440   +/-   ##
====================================
- Coverage    98%     98%   -1%     
====================================
  Files        38      38           
  Lines      5603    5626   +23     
====================================
+ Hits       5497    5519   +22     
- Misses      106     107    +1