Simplify database_connection_url

* does not expects dynamic scoping.
* does not uses eval.

Change-Id: I5ba4e5b7ffaabbb3c2bddadf9e53a2875de8b7c0
diff --git a/lib/quantum b/lib/quantum
index 3466162..57bcc93 100644
--- a/lib/quantum
+++ b/lib/quantum
@@ -405,9 +405,7 @@
     Q_PLUGIN_CONF_FILE=$Q_PLUGIN_CONF_PATH/$Q_PLUGIN_CONF_FILENAME
     cp $QUANTUM_DIR/$Q_PLUGIN_CONF_FILE /$Q_PLUGIN_CONF_FILE
 
-    database_connection_url dburl $Q_DB_NAME
-    iniset /$Q_PLUGIN_CONF_FILE DATABASE sql_connection $dburl
-    unset dburl
+    iniset /$Q_PLUGIN_CONF_FILE DATABASE sql_connection `database_connection_url $Q_DB_NAME`
 
     _quantum_setup_rootwrap
 }