Check search limit depth with an inequality

Otherwise, when we check for equality, the test fails if the search starts beneath
the max depth.
Eg: if I have the page ns1:ns2:mypage in my wiki, and launch the xmlrpc query
getPagelist("ns1", "depth => 1"), without this patch, it retrieves mypage

The following test (made with the xml-rpc client [dokuJClient](https://github.com/gturri/dokujclient)) fails without this patch, but succeeds with it:

    @org.junit.Test
    public void testGetPagelistWithAMaxDepth() throws Exception {
    	//Setting up test environmnent
    	DokuJClient client = new DokuJClient(TestParams.url, TestParams.user, TestParams.password);
    	client.putPage("ns:shallow_page", "some text");
    	client.putPage("ns:subns:deep_page", "some text");
    	
    	Map<String, Object> options = new HashMap<String, Object>();
    	options.put("depth", 1);
    	
    	//Testing
    	List<PageDW> pages = client.getPagelist("ns", options);
    	assertEquals(1, pages.size());
    	assertEquals("ns:shallow_page", pages.get(0).id());
    	
    	pages = client.getPagelist("ns:subns", options);
    	assertEquals(0, pages.size());
    }