AllowEditInvariantFromNonDefault : Fix property write guard to use correct variant ID (closes #20250) (#20277)

Fix property write guard to use correct variant ID

Replaces the use of propertyVariantId with _datasetVariantId in the property write guard check to ensure permissions are evaluated for the correct variant.

src/Umbraco.Web.UI.Client/src/packages/content/content/global-components/content-workspace-property.element.ts

@@ -115,7 +115,7 @@ export class UmbContentWorkspacePropertyElement extends UmbLitElement {
 					this._workspaceContext.propertyWriteGuard.isPermittedForVariantAndProperty(
 						propertyVariantId,
 						this._propertyType,
-						propertyVariantId,
+						this._datasetVariantId,
 					),
 					(write) => {
 						this._writeable = write;