Navigator: fix two nits (WordPress#60273)

Co-authored-by: jsnajdr <[email protected]>
Co-authored-by: Mamaduka <[email protected]>

Author: jsnajdr

packages/components/src/navigator/navigator-screen/component.tsx

@@ -106,7 +106,7 @@ function UnconnectedNavigatorScreen(
 
 		// When navigating back, if a selector is provided, use it to look for the
 		// target element (assumed to be a node inside the current NavigatorScreen)
-		if ( location.isBack && location?.focusTargetSelector ) {
+		if ( location.isBack && location.focusTargetSelector ) {
 			elementToFocus = wrapperRef.current.querySelector(
 				location.focusTargetSelector
 			);

packages/edit-site/src/components/global-styles/screen-style-variations.js

@@ -19,7 +19,6 @@ function ScreenStyleVariations() {
 	return (
 		<>
 			<ScreenHeader
-				back="/"
 				title={ __( 'Browse styles' ) }
 				description={ __(
 					'Choose a variation to change the look of the site.'