slider unit tests: added missing reference to jquery.ui.mouse.js

Author: rdworth

tests/unit/slider/slider.html

@@ -6,6 +6,7 @@
 	<script type="text/javascript" src="../../../jquery-1.3.2.js"></script>
 	<script type="text/javascript" src="../../../ui/jquery.ui.core.js"></script>
 	<script type="text/javascript" src="../../../ui/jquery.ui.widget.js"></script>
+	<script type="text/javascript" src="../../../ui/jquery.ui.mouse.js"></script>
 	<script type="text/javascript" src="../../../ui/jquery.ui.slider.js"></script>
 
 	<link   type="text/css"       href="../testsuite.css" rel="stylesheet" />