xGroupSet.schema.psm1: Fix Custom DSC Resource Kit PSSA rule violations

[mhendric]

Details of the scenario you tried and the problem that is occurring

There's a number of script analyzer issues getting reported in PSWSIISEndpoint.psm1. These should be fixed.

Verbose logs showing the problem

[00:05:15]     Context xGroupSet.schema.psm1
[00:05:16]       [+] Should pass all error-level PS Script Analyzer rules 75ms
[00:05:16]       [+] Should pass all required PS Script Analyzer rules 229ms
[00:05:16]       [+] Should pass all flagged PS Script Analyzer rules 61ms
[00:05:16]       [+] Should pass any recently-added, error-level PS Script Analyzer rules 62ms
[00:05:16]       [+] Should not suppress any required PS Script Analyzer rules 107ms
[00:05:17] Custom DSC Resource Kit PSSA rule(s) did not pass.
[00:05:17] The following PSScriptAnalyzer rule 'DscResource.AnalyzerRules\Measure-ParameterBlockParameterAttribute' errors need to be fixed:
[00:05:17] xGroupSet.schema.psm1 (Line 41): A [Parameter()] attribute must be the first attribute of each parameter and be on its own line. See https://github.com/PowerShell/DscResources/blob/master/StyleGuidelines.md#correct-format-for-parameter-block
[00:05:17] xGroupSet.schema.psm1 (Line 45): A [Parameter()] attribute must be the first attribute of each parameter and be on its own line. See https://github.com/PowerShell/DscResources/blob/master/StyleGuidelines.md#correct-format-for-parameter-block
[00:05:17] xGroupSet.schema.psm1 (Line 48): A [Parameter()] attribute must be the first attribute of each parameter and be on its own line. See https://github.com/PowerShell/DscResources/blob/master/StyleGuidelines.md#correct-format-for-parameter-block
[00:05:17] xGroupSet.schema.psm1 (Line 51): A [Parameter()] attribute must be the first attribute of each parameter and be on its own line. See https://github.com/PowerShell/DscResources/blob/master/StyleGuidelines.md#correct-format-for-parameter-block
[00:05:17] For instructions on how to run PSScriptAnalyzer on your own machine, please go to https://github.com/powershell/PSScriptAnalyzer
[00:05:17] Common Tests - Custom Script Analyzer Rules will not fail unless you opt-in.
[00:05:17] To opt-in, create a '.MetaTestOptIn.json' at the root
[00:05:17] of the repo in the following format:
[00:05:17] [
[00:05:17]      "Common Tests - Custom Script Analyzer Rules"
[00:05:17] ]
[00:05:17]       [+] Should pass all custom DSC Resource Kit PSSA rules 607ms

Version of the DSC module that was used ('dev' if using current dev branch)

dev

[mhendric]

I got this.