[r8175] clicking a line in the depot's lines list does not close the list

[gauthier]

r8175, linux 32 bits

Open a depot, open the lines'list, click a line to assign it to a convoy, the list stays opened. One has to press the Enter key to close the list.

[Ters]

I've seen this with another drop down list as well. I think it was the filter in the bottom-right of the depot window.

[prissi]

should be fixed in r8193