mu-plugins/jquery-filters: Remove blog_id condition

In standalone mode, this isn't set.

Follows-up 863a48e, which added it to support "switch_to_blog".
I don't know what that is exactly, but I know this code can't be having
a useful effect because the surrounding code changed since then.

It now uses JQUERY_LIVE_SITE which can only be set once, so at most
this conditional can change it from applying to not applying overrides.
Maybe there's a context during sunrise.php where this matters, but we
are not creating new sites in the legacy mutlisite setup.

mu-plugins/jquery-filters.php

@@ -22,10 +22,8 @@
 		// For standalone sites, let Puppet manage plugins.
 		continue;
 	}
-	add_filter( 'pre_option_' . $option, function( $null ) use ( $value, $blog_id ) {
-		if ( $blog_id == get_current_blog_id() )
-			return $value;
-		return $null;
+	add_filter( 'pre_option_' . $option, function () use ( $value ) {
+		return $value;
 	} );
 }
 unset( $sites, $options, $option );