Declaring `h` function without checking if `function_exists` in VendorVersionsPanel.phtml

[SadeghPM]

Declaring h function without checking if function_exists in VendorVersionsPanel.phtml file, cause fatal error in some situation.

for example installing runtracy alongside robmorgan/phinx cause fatal error.

tracy:

<?php

use Tracy\Helpers;

function h($str) {
	return htmlspecialchars($str, ENT_QUOTES | ENT_HTML5, 'UTF-8');
}
...

robmorgan/phinx:

if (!function_exists('h')) {
    /**
     * Convenience method for htmlspecialchars.
     */
    function h($text, $double = true, $charset = null)
    {
...

For solving problem , please use if (!function_exists('h')) { to declare h function.