Enable Default PSSCript Rules

[SSvilen]

Pull Request (PR) description

I have noticed that the default rules for PSScriptAnalyzer were not enabled, although a bunch of them are part of IncludeRules array.
Adding following line in analyzersettings.psd1 would enable them:
IncludeDefaultRules = $true

This Pull Request (PR) fixes the following issues

• Fixes PSScriptAnalyzer: Enable default rules  #491

Task list

• Added an entry under the Unreleased section in the CHANGELOG.md.
  Entry should say what was changed, and how that affects users (if applicable).
• Resource documentation added/updated in resource directory README.md.
• Resource parameter descriptions added/updated in schema.mof
  and comment-based help.
• Comment-based help added/updated.
• Conceptual help topic added/updated (cultureFolder\about_ResourceName.help.txt).
• 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 #492 into dev will not change coverage.
The diff coverage is n/a.

@@         Coverage Diff         @@
##            dev   #492   +/-   ##
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  Coverage    98%    98%           
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  Files        23     23           
  Lines      3065   3065           
  Branches     10     10           
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  Hits       3020   3020           
  Misses       35     35           
  Partials     10     10

[johlju]

Reviewed 2 of 2 files at r1.
Reviewable status: complete! all files reviewed, all discussions resolved