FAST.Farm: last wake plane disappears when the array of planes is full

[ebranlard]

Bug description
Looking at visualization, and outputs, it seems like the last wake plane disappears when the array of planes is full.

To Reproduce

• Use the following r-test: https://github.com/OpenFAST/r-test/tree/dev/glue-codes/fast-farm/TSinflow
• Enable VTK plane visualizations NOutDisWindYZ=2, NOutDisWindXZ =1
• Look at VTK outputs
• Potentially adjust the location of the vertical plane output, or NumPlanes.
  The wake will appear to jump, disappear from the output after a given time step. See animation below:

WakeJump.mp4

Expected behavior
The wake shouldn't jump.

OpenFAST Version
Likely there since FAST.Farm was introduced. Was present before the CurledWake (<=v3.3).