Fix wforms reporting binned instead of unbinned pixel dimensions

[Copilot]

ucam.Rhead.wforms was emitting window nx/ny in binned pixels, but udriver/usdriver GUIs expect unbinned pixel coordinates.

Changes

• hipercam/ucam.py: In the wforms construction for both ULTRACAM and ULTRASPEC modes, multiply the binned window dimensions by their respective binning factors to recover unbinned values:

# Before (binned)
nx = wl.nx
ny = wl.ny

# After (unbinned)
nx = wl.nx * wl.xbin
ny = wl.ny * wl.ybin

hcam.Rhead.wforms is unaffected — it reads NX/NY directly from raw FITS header keywords, which are already in unbinned pixels.

Original prompt

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This section details on the original issue you should resolve

<issue_title>WFORMS not showing the correct output for binned data</issue_title>
<issue_description>The wforms property of ucam.Rhead and hcam.Rhead are supposed to match the input expected in the instrument GUIs hdriver and udriver.

However, as pointed out by @pkerry in HiPERCAM/hcam_obsutils#1, the GUIs take values in unbinned pixels whereas wforms prints out nx and ny in binned pixels.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes WFORMS not showing the correct output for binned data #158

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