FreePBX generated CSS link for module css files is wrong.

Modules are not loading their css files. The link being generated contains a php variable. The function generating the link has a php variable contained within single quotes.

Currently:

$html .= '<link href="assets/$module_name/css/' . $module_page . '/' . $p_file . '" rel="stylesheet" type="text/css" />';

Proposed fix:

$html .= '<link href="assets/' . $module_name . '/css/' . $module_page . '/' . $p_file . '" rel="stylesheet" type="text/css" />';

Looking through git, it appears the problem is present in 2.10, 2.11, and 12.0.

File: /admin/libraries/view.functions.php
Line: 346 (2.10), 359 (2.11, 12.0)