Fix URLBuilderTest.

If this is run with the wrong classpath, the test fails as apparently
having a 'test' folder isn't hugely uncommon. Use a less likely name.

Change-Id: I4c8bcb2be8b6768b3247e91d176932e7fac24d2e
Reviewed-on: http://gerrit.dmdirc.com/3681
Automatic-Compile: DMDirc Build Manager
Reviewed-by: Greg Holmes <greg@dmdirc.com>

test/com/dmdirc/util/URLBuilderTest.java

@@ -104,7 +104,7 @@ public class URLBuilderTest {
     public void testGetUrlForDMDircResourceNonExistant() {
         URLBuilder urlBuilder
                 = new URLBuilder(pluginManagerProvider, themeManagerProvider, eventBus);
-        Assert.assertNull(urlBuilder.getUrlForDMDircResource("test"));
+        Assert.assertNull(urlBuilder.getUrlForDMDircResource("test12345678"));
     }
 
     @Test