Audit culture bugs (#7707)

* Added comments and fixed CultureInfo /  StringComparison where appropriate

* Addressed comments

* Fixed comment

src/modules/launcher/Plugins/Microsoft.Plugin.WindowWalker/Components/SearchController.cs

@@ -54,6 +54,7 @@ namespace Microsoft.Plugin.WindowWalker.Components
 
             set
             {
+                // Using CurrentCulture since this is user facing
                 searchText = value.ToLower(CultureInfo.CurrentCulture).Trim();
             }
         }