FluentUI2: Fix slider percentage culture issue (#6496)

Author: njannink

Source/Blazorise.FluentUI2/Components/Slider.razor.cs

@@ -1,5 +1,6 @@
 #region Using directives
 using System.Threading.Tasks;
+using Blazorise.Extensions;
 using Blazorise.Utilities;
 #endregion
 
@@ -74,7 +75,7 @@ private void BuildInputStyles( StyleBuilder builder )
         TValue max = Converters.ChangeType<TValue>( Max );
 
         var currentValue = MathUtils.Clamp( CurrentValue, min, max );
-        var valuePercent = MathUtils.GetPercent( currentValue, min, max );
+        var valuePercent = MathUtils.GetPercent( currentValue, min, max ).ToCultureInvariantString();
 
         builder.Append( $"--fui-Slider--direction: 90deg;--fui-Slider--progress: {valuePercent}%;" );