4 products on each row

I am using this code:

add_filter( 'loop_shop_columns', 'wc_loop_shop_columns', 1, 10 );
function wc_loop_shop_columns( $number_columns ) {
	return 4;
}

This code doesn’t work for me but I know why. In my theme I found this code:

function roots_clean_style_tag($input) {
  preg_match_all("!<link rel='stylesheet'\s?(id='[^']+')?\s+href='(.*)' type='text/css' media='(.*)' />!", $input, $matches);
  // Only display media if it's print
  $media = $matches[3][0] === 'print' ? ' media="print"' : '';
  return '<link rel="stylesheet" href="' . $matches[2][0] . '"' . $media . '>' . "\n";
}
add_filter('style_loader_tag', 'roots_clean_style_tag');

When I remove this, then the row is showing me 4 products, just like I want it.

But what is this code in my theme doing anyway??