Fix issue where PAA is falsely disabled due to FOV
This fixes an issue widely reported on the forum, where polar alignment is falsely disabled due to small FOV, even though the FOV isn't small.
See, for instance, https://indilib.org/forum/ekos/10455-paa-disabled.html#76142
The issue was that the polar alignment was disabled when the FOV was too small, but it wasn't being enabled if the FOV was large enough.
I imagine it is possible that polar alignment was disabled during initialization, e.g. if calculateFOV was called before the camera parameters were known (and e.g. the pixel size was set to 0), but then never re-enabled even though the updated FOV computations showed the FOV was fine.