improve defaultparams loplugin

to catch calling params with defaults like "= OUSString()"

Change-Id: Iad060e318ed492c22f8be44e326174fe6d28fff9
Reviewed-on: https://gerrit.libreoffice.org/22932
Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Noel Grandin <noelgrandin@gmail.com>

cppuhelper/source/defaultbootstrap.cxx

@@ -93,9 +93,7 @@ cppu::defaultBootstrap_InitialComponentContext(rtl::OUString const & iniUri)
             true));
     assert(!context_values.empty());
     css::uno::Reference< css::uno::XComponentContext > context(
-        createComponentContext(
-            &context_values[0], context_values.size(),
-            css::uno::Reference< css::uno::XComponentContext >()));
+        createComponentContext(&context_values[0], context_values.size()));
     smgr->setContext(context);
     cppu::installTypeDescriptionManager(tmgr.get());
     return context;