Fix the [code] bbcode

[Kyojii]

Currently putting bbcode inside the [code] bbcode it is still parsed as bbcode. This shouldn't happen and I was wondering if someone would be able to help me fix this.

this text shouldn't be bold or underlined

	function handle_bbcode_code($code)
	{
		global $vbulletin, $vbphrase, $stylevar, $show;

		// remove unnecessary line breaks and escaped quotes
		$code = str_replace(array('<br>', '<br />'), array('', ''), $code);

		$code = $this->strip_front_back_whitespace($code, 1);

		if ($this->printable)
		{
			$code = $this->emulate_pre_tag($code);
			$template = 'bbcode_code_printable';
		}
		else
		{
			$blockheight = $this->fetch_block_height($code);
			$template = 'bbcode_code';
		}

		eval('$html = "' . fetch_template($template) . '";');
		return $html;
	}

In the ACP for custom bbcodes there is a way to disable bbcode inside of a bbcode but for some reason that was not applied to this bbcode. I tried converting $code to htmlentities and thought it would make the bbcode parser not parse it as bbcode but that didn't work. It simply made the code tag output html.