Remove a forgotten call to a non-existent method

This can fall through to the default case.

Author: JanJakes

wp-includes/sqlite-ast/class-wp-sqlite-driver.php

@@ -1792,8 +1792,6 @@ private function translate( $node ): ?string {
 					return implode( ' ', $parts );
 				}
 				return $this->translate_sequence( $node->get_children() );
-			case 'schemaRef':
-				return $this->translate_schema_identifier( $node );
 			case 'qualifiedIdentifier':
 			case 'tableRefWithWildcard':
 				$parts = $node->get_descendant_nodes( 'identifier' );