Modify DecimalUpDown basic test to ensure culture is respected in string-value conversions#3865

Keboo merged 3 commits intomasterMaterialDesignInXAML/MaterialDesignInXamlToolkit:masterfrom

DecimalUpDownTestsWithCultureMaterialDesignInXAML/MaterialDesignInXamlToolkit:DecimalUpDownTestsWithCultureCopy head branch name to clipboard