fix overridden permissions with same name belonging to different role

Author: mivale

src/Kodeine/Acl/Traits/HasPermission.php

@@ -50,8 +50,12 @@ function () {
             foreach ($role->getPermissions() as $slug => $array) {
                 if (array_key_exists($slug, $permissions)) {
                     foreach ($array as $clearance => $value) {
-                        if (array_key_exists($clearance, $permissions[$slug])) {
+                        if (! array_key_exists($clearance, $permissions[$slug])) {
                             ! $value ?: $permissions[$slug][$clearance] = true;
+                        } else {
+                            if ($permissions[$slug][$clearance] != $value) {
+                                $permissions[$slug][$clearance] = $value;
+                            }
                         }
                     }
                 } else {