fix: fix save button icon on pfSense CE 2.8.0

Author: jaredhendrickson13

pfSense-pkg-saml2-auth/files/usr/local/www/saml2_auth/index.php

@@ -239,7 +239,7 @@
 $form->add($idp_section);
 $form->add($sp_section);
 $form->add($advanced_section);
-$form->addGlobal(new Form_Button('save', 'Save', null, 'fa-save'))->addClass('btn-primary');
+$form->addGlobal(new Form_Button('save', 'Save', null, 'fa-solid fa-save'))->addClass('btn-primary');
 
 # PRINT OUR FORM AND PFSENSE FOOTER
 print $form;