Fixes issue 3597: unit test failure in mainframe due to unit tests being annoying

Change-Id: I52f6268fd298c18a4f0a3972d305b507d2ac32d0
Reviewed-on: http://gerrit.dmdirc.com/579
Automatic-Compile: Gregory Holmes <greboid@dmdirc.com>
Reviewed-by: Gregory Holmes <greboid@dmdirc.com>

test/com/dmdirc/addons/ui_swing/MainFrameTest.java

@@ -53,6 +53,8 @@ public class MainFrameTest {
         IdentityManager.getAddonIdentity().setOption("test", "debugEDT", "false");
         IdentityManager.getAddonIdentity().setOption("test", "windowMenuItems", "1");
         IdentityManager.getAddonIdentity().setOption("test", "windowMenuScrollInterval", "1");
+        IdentityManager.getAddonIdentity().setOption("test", "desktopbackground", "");
+        IdentityManager.getAddonIdentity().setOption("test", "desktopbackgroundoption", "STRETCH");
         controller = new SwingController();
         controller.setDomain("test");
         controller.onLoad();