Make GlobalConfig::resolveValue() recursive again

Dropping this broke resolution is some cases.

Fixes theseer#218.

Author: redbeardcreator

src/config/GlobalConfig.php

@@ -181,6 +181,9 @@ function($matches) use ($vars, $line) {
                     }
                     return $vars[$matches[1]];
                 }, $value);
+            if (preg_match('/\${(.*?)}/', $result)) {
+                $result = $this->resolveValue($result, $vars, $line);
+            }
             return $result;
         }