notebooks: fix built-in renderers not being preferred by default

For https://github.com/microsoft/vscode/issues/125876\#issuecomment-953072778

Author: connor4312

src/vs/workbench/contrib/notebook/browser/notebookServiceImpl.ts

@@ -342,7 +342,7 @@ export class NotebookOutputRendererInfoStore {
 
 		if (mimeTypeSupportedByCore(mimeType)) {
 			renderers.push({
-				score: ReuseOrder.BuiltIn << 8,
+				score: ReuseOrder.BuiltIn,
 				ordered: {
 					mimeType,
 					rendererId: BUILTIN_RENDERER_ID,