Fix misleading message

Some servers do not provide activities at all. In that case, the label
should not read "have activities enabled", because that implies that
they could be provided, but are disabled. Which is misleading.

src/gui/activitywidget.cpp

@@ -155,7 +155,7 @@ void ActivityWidget::showLabels()
     t.clear();
     QSetIterator<QString> i(_accountsWithoutActivities);
     while (i.hasNext()) {
-        t.append(tr("<br/>Account %1 does not have activities enabled.").arg(i.next()));
+        t.append(tr("<br/>Account %1 does not provide activities.").arg(i.next()));
     }
     _ui->_bottomLabel->setTextFormat(Qt::RichText);
     _ui->_bottomLabel->setText(t);