Fix for Remove title attributes

Hi @joedolson,
our plugin use data-title="" attributes, but the "Remove title attributes inserted into post content and featured images." option removes these titles. I checked your code and I think I have a solution for you.

Adding [\s] to the start of the regexp will match a whitespace before the title attribute, so it will only match <img title="test"/>, but does not match <div data-title="test"></div>

Original code:

function wpa_image_titles( $content ) {
	$results = array();
	preg_match_all( '|title="[^"]*"|U', $content, $results );
	var_dump($results);
	foreach ( $results[0] as $img ) {
		$content = str_replace( $img, '', $content );
	}

	return $content;
}

Updated code:

function wpa_image_titles( $content ) {
	$results = array();
	preg_match_all( '|[\s]title="[^"]*"|U', $content, $results );
	var_dump($results);
	foreach ( $results[0] as $img ) {
		$content = str_replace( $img, '', $content );
	}

	return $content;
}