cid#1251600 Uncaught exception

we don't need this hunk of code for the demo anyway

Change-Id: I45e30d9ae190b443d15fa0933241fb75c0fbb8b1
Reviewed-on: https://gerrit.libreoffice.org/78071
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>

canvas/workben/canvasdemo.cxx

@@ -624,11 +624,6 @@ int DemoApp::Main()
         return 1;
     }
 
-    // Create UCB (for backwards compatibility, in case some code still uses
-    // plain createInstance w/o args directly to obtain an instance):
-    ::ucb::UniversalContentBroker::create(
-        comphelper::getProcessComponentContext() );
-
     ScopedVclPtr<TestWindow> aWindow = VclPtr<TestWindow>::Create();
     aWindow->Show();