Fix that html tags instead of F1 button were for QML tool tips

Regression introduced by 6ed775f5

Change-Id: Ibef3453339d431dcd7b890d18c27f42f198070e8
Task-number: QTCREATORBUG-15225
Reviewed-by: Marco Benelli <marco.benelli@theqtcompany.com>
Reviewed-by: Thomas Hartmann <Thomas.Hartmann@theqtcompany.com>
Reviewed-by: Robert Loehning <robert.loehning@theqtcompany.com>
Reviewed-by: Eike Ziller <eike.ziller@theqtcompany.com>