FlightData HUD Update: Positioning HUD Buttons

[Matthew-Alti]

Update: The three buttons on the HUD, namely: 'VIBE', 'EKF', 'PreArm', placed towards the center bottom section of the HUD have now been centered with the HUD. The VIBE and EKF buttons are now on either side of the center of the HUD with the PreArm button directly in line with the EKF button. (See screenshots attached for the updated display)