Update ObservatoryMetadata.py to remove F from HDZF Sensor Orientation
F should not be included as a sensor orientation, see references.
- ref1: (ImagCDF) Elements Recorded = DIF, VectorSensOrientation = HDZ, Institution = BGS
- ref2: (IMFV1.22 - Comp) F should only be included if its measured by a scalar instrument
- ref3: (ImagCDF) sensor orientation should represent the physical orientation of observing instruments (F is a magnitude, and a calculation)