fix lint (PSScriptAnalyzer) issues (#62)

#### 📖 Summary

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- [x] Tested via Drone.io pipeline
- [ ] Custom test
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##### Details / Justification

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Co-authored-by: OCram85 <marco.blessing@googlemail.com>
Reviewed-on: #62

src/Store/Get-CredentialStore.Tests.ps1

@@ -14,8 +14,6 @@ BeforeAll {
 Describe "Get-CredentialStore" {
     Context "Basic logic tests" {
         It "Read CS without params" {
-            $TestCredentialStore = './resources/cs/CredentialStore.json'
-            $TestPfxCert = './resources/cs/PSCredentialStore.pfx'
             if (! (Test-Path -Path (Get-DefaultCredentialStorePath)) ) {
                 { New-CredentialStore -Force } | Should -Not -Throw
             }