Don't throw error when 'Force' switch is specified

This fixes error when 'Copy-Item2 -Force' would not overwrite existing files

NTFSSecurity/ItemCmdlets/CopyItem2.cs

@@ -85,7 +85,7 @@ namespace NTFSSecurity
                     actualDestination = destination;
                 }
 
-                if (File.Exists(actualDestination))
+                if (!force & File.Exists(actualDestination))
                 {
                     WriteError(new ErrorRecord(new AlreadyExistsException(), "DestinationFileAlreadyExists", ErrorCategory.ResourceExists, actualDestination));
                     return;
@@ -129,4 +129,4 @@ namespace NTFSSecurity
             base.EndProcessing();
         }
     }
-}
+}