Flight Plan: Loiter command's 3rd column (Param3) should be labelled "Dir 1=CW" for AC3.2

Once we release AC3.2, in the MP's Flight Plan's command list, the 3rd column label should be "Dir 1=CW" for Loiter-time, Loiter-unlimited and Loiter-turns. Currently it's blank.

This is required because as we will be sharing more of the command processing code between Plane, Rover and Copter, copter users will see a "1" or "-1" appearing in the column so it should be labelled.

The value is actually ignored for Loiter_Time and Loiter_Unlimited in copters because copters don't need to circle to maintain position but it will be used for Loiter_Turns commands.

Inspect Mission Planner's Flight Plan command list and the label handling for Loiter-time, Loiter-unlimited, and Loiter-turns commands. Confirm how Param3 is displayed, then verify that the third column is labelled "Dir 1=CW" for AC3.2 and that the existing command values remain visible.

Written by the indexing model from the issue text.