Removed display of "-100%" in the progress bar if an error occurs while downloading.

git-svn-id: svn+ssh://svn.code.sf.net/p/supertuxkart/code/main/trunk@8298 178a84e3-b1eb-0310-8ba1-8eac791a3b58

src/states_screens/dialogs/addons_loading.cpp

@@ -116,6 +116,8 @@ void AddonsLoading::onUpdate(float delta)
         if(progress<0)
         {
             m_state->setText(_("Download failed.\n"), false);
+            // Avoid displaying '-100%' in case of an error.
+            m_progress->setVisible(false);
             m_back_button->setText(_("Back"));
             return;
         }