E_ALL Compliance: Fix PHP Notices in project_release

Three simple fixes at this point.

I couldn't quite decide what to do about:

Notice: Undefined variable: required in project\release\project_release.module on line 367

It looks like $required was a parameter that's been replaced by $size:

/**
 * Modifies the given $form array to add the appropriate form element
 * for the requested version field. Since the 20+ lines of code in
 * here have to be duplicated 6 times in project_release_form(), this
 * function exists so we can reuse the code.
 * @see project_release_form
 * @ingroup project_release_internal
 *
 * @param $form Form array to modify
 * @param $release Relase node the form is for
 * @param $modify Boolean indicating if we should allow modifications
 * @param $format Version format string for this project
 * @param $name Name of this version element
 * @param $title Translatable title of the form element
 * @param $description Translatable description of the form element.
 * @param $required Boolean for if the form element should be required
 */
function _project_release_form_add_version_element(&$form, $release, $modify, $format, $name, $title, $description = '', $size = 10) {