cmdline dropdown missing comma

[martinmagnusson]

Now that v3.0.3 requires a comma before the tag in the cmdline, the behaviour of the cmdline dropdown list is inconvenient/inconsistent. The dropdown lists previous activities with tags, but without the comma, so if I select one of my previous tagged activities, I get a new activity with a category named "Category #Tag" instead of "Category" with the corresponding "Tag". The dropdown should rather have commas in the right place.