Don't need to check for array in properties metadata

lib/class-wp-theme-json-gutenberg.php

@@ -3519,22 +3519,11 @@ protected static function remove_insecure_styles( $input ) {
 			if ( static::is_safe_css_declaration( $declaration['name'], $declaration['value'] ) ) {
 				$path = static::PROPERTIES_METADATA[ $declaration['name'] ];
 
-				if ( is_array( $path ) && is_array( $path[0] ) ) {
-					foreach ( $path as $path_part ) {
-						// Check the value isn't an array before adding so as to not
-						// double up shorthand and longhand styles.
-						$value = _wp_array_get( $input, $path_part, array() );
-						if ( ! is_array( $value ) ) {
-							_wp_array_set( $output, $path_part, $value );
-						}
-					}
-				} else {
-					// Check the value isn't an array before adding so as to not
-					// double up shorthand and longhand styles.
-					$value = _wp_array_get( $input, $path, array() );
-					if ( ! is_array( $value ) ) {
-						_wp_array_set( $output, $path, $value );
-					}
+				// Check the value isn't an array before adding so as to not
+				// double up shorthand and longhand styles.
+				$value = _wp_array_get( $input, $path, array() );
+				if ( ! is_array( $value ) ) {
+					_wp_array_set( $output, $path, $value );
 				}
 			}
 		}