Clean up code for testing (#87125)

client/landing/stepper/declarative-flow/internals/steps-repository/pattern-assembler/pattern-assembler-container.tsx

@@ -1,5 +1,4 @@
 import { BlockRendererProvider, PatternsRendererProvider } from '@automattic/block-renderer';
-import { isEnabled } from '@automattic/calypso-config';
 import { getPlaceholderSiteID } from '@automattic/data-stores/src/site/constants';
 import { useMemo } from 'react';
 import StepperLoader from '../../components/stepper-loader';
@@ -47,10 +46,7 @@ const PatternAssemblerContainer = ( {
 				// such as the logo, title, tagline, pages, posts, etc.
 				// For the newly created site, we use the placeholder site to render the content.
 				// Otherwise, we use the current site to display the site-related blocks.
-				// For Horizon, forcing to use the content from Assembler demo site to help testing with any existing site.
-				siteId={
-					isNewSite || isEnabled( 'pattern-assembler/v2' ) ? getPlaceholderSiteID() : siteId
-				}
+				siteId={ isNewSite ? getPlaceholderSiteID() : siteId }
 				stylesheet={ stylesheet }
 				patternIdsByCategory={ patternIdsByCategory }
 				// Use siteInfo to overwrite site-related things such as title, and tagline.