Fix detection mask on a cropped image

[aaronwmorris]

Last April you made a change to indi-allsky/flask/view.py (patch #1227) that may have fixed the requester issue but broke it for me because you forgot to crop the star detection mask and this caused the charts to not work for me.

I patched it for myself around line 1060 in view.py with

    img_crop_roi = self.indi_allsky_config.get('IMAGE_CROP_ROI', [])
    x1 = int(img_crop_roi[0])
    y1 = int(img_crop_roi[1])
    x2 = int(img_crop_roi[2])
    y2 = int(img_crop_roi[3])
    numpy_mask = numpy_mask[y1:y2,x1:x2]

[aaronwmorris]

Merged #1289