Use comphelper::getProcessComponentContext()

The context in the mxContext member does not seem to be usable for
what we need it for here. Using what
comphelper::getProcessComponentContext() returns works better. Let's
hope it has no unintended side-effects.

This likely makes the mxContext member unused, but I did not bother
removing it yet, to keep this commit minimal.

Change-Id: Ic048683b066af7952e2e84b03ea306e7daaba259

vbahelper/source/vbahelper/vbacommandbarhelper.cxx

@@ -111,12 +111,13 @@ void VbaCommandBarHelper::Init( )
         throw uno::RuntimeException( "Not implemented" );
     }
 
+    css::uno::Reference< css::uno::XComponentContext > xContext(comphelper::getProcessComponentContext());
     css::uno::Reference< css::ui::XModuleUIConfigurationManagerSupplier > xUICfgMgrSupp(
-        css::ui::theModuleUIConfigurationManagerSupplier::get(mxContext) );
+        css::ui::theModuleUIConfigurationManagerSupplier::get( xContext ) );
 
     m_xAppCfgMgr.set( xUICfgMgrSupp->getUIConfigurationManager( maModuleId ), uno::UNO_QUERY_THROW );
 
-    css::uno::Reference< css::container::XNameAccess > xNameAccess = css::ui::theWindowStateConfiguration::get( mxContext );
+    css::uno::Reference< css::container::XNameAccess > xNameAccess = css::ui::theWindowStateConfiguration::get( xContext );
 
     m_xWindowState.set( xNameAccess->getByName( maModuleId ), uno::UNO_QUERY_THROW );
 }