Make sure openWith handles default editors

Fixes #99252

We still need to override openeing of 'default' editors so that we properly close any already open custom editors in the group

src/vs/workbench/contrib/customEditor/browser/customEditors.ts

@@ -498,10 +498,6 @@ export class CustomEditorContribution extends Disposable implements IWorkbenchCo
 		}
 
 		if (id) {
-			if (editor instanceof FileEditorInput && id === defaultCustomEditor.id) {
-				return undefined;
-			}
-
 			return {
 				override: this.customEditorService.openWith(resource, id, { ...options, ignoreOverrides: true }, group)
 			};