fix usage of dsym file tag

This commit amends 3db574b81ee879182b3ab5d3d83641aa42a45141.

Task-number: QBS-488

Change-Id: Ic940cc5667dfb0959fd89f32cc59d36da46e8ef5
Reviewed-by: Ivan Komissarov <ABBAPOH@me.com>
Reviewed-by: Christian Kandeler <christian.kandeler@digia.com>