[1.25 f] City merge happens despite aborting

[fibol]

On the Decision to merge a city even if you select a target it will go ahead and attempt the merger, even if you then hit the "Abort" button.
If you do not select a target city it will not do so.
When pressing the abort button it should always abort the merger.

Attached are images showing the issue and the save file.

[Vic]

Thanks for the report! will fix