Fix icon names in BootstrapIconUtility (#1086)

Removed invisible characters from IconName.Calendar2 and IconName.Calendar2Check in BootstrapIconUtility.cs. Updated values to "calendar2" and "calendar2-check" for improved functionality and consistency. Co-authored-by: Jens-Christian Skibakk <jens.christian.skibakk@lexit.no>

Author: jenscski

blazorbootstrap/Utils/BootstrapIconUtility.cs

@@ -366,8 +366,8 @@ public static string ToIconName(IconName iconName)
  IconName.Calculator => "calculator",
  IconName.CalculatorFill => "calculator-fill",
  IconName.Calendar => "calendar",
- IconName.Calendar2 => "​calendar2",
- IconName.Calendar2Check => "​calendar2-check",
+ IconName.Calendar2 => "calendar2",
+ IconName.Calendar2Check => "calendar2-check",
  IconName.Calendar2CheckFill => "calendar2-check-fill",
  IconName.Calendar2Date => "calendar2-date",
  IconName.Calendar2DateFill => "calendar2-date-fill",