Update FunctionCallSignatureSniff to allow non-isolated parentheses on multiline calls

This allows the following code block to be valid if the new property `requireIsolatedMultilineCallParentheses` is set to `false` on the `PEAR.Functions.FunctionCallSignature` sniff:

```php
foreach ( $core_options as $option_name => $real_value ) {
	add_filter( "pre_option_{$option_name}", function( $value ) use ( $real_current_blog_id, $real_value ) {
		if ( get_current_blog_id() == $real_current_blog_id ) {
			return $real_value + 1;
		} else {
			return $value;
		}
	} );
}
```

See https://github.com/WordPress-Coding-Standards/WordPress-Coding-Standards/pull/272