-Codechange: Simplify ShowDropDownListAt (Juanjo)

git-svn-id: svn://svn.openttd.org@26691 6aa0318a-3be1-0310-93fa-89fd2396df07
-Fix [FS#6059]: Ordering a vehicle to a competitor's rail waypoint displayed an error message. Ignore the click as is done for the other order types to competitor's stuff. (Juanjo)

git-svn-id: svn://svn.openttd.org@26692 6aa0318a-3be1-0310-93fa-89fd2396df07