gamma-control: Read ramps using pread

read advances the file description offset, and requires the client to
ensure that it is reset appropriately before the next gamma ramp
submission. As there is no event to indicate that wlroots finished
processing the new gamma ramp, this can result in a race between the
client seeking in the file and wlroots reading its content.

Use pread with a fixed offset instead.

Fixes: https://gitlab.freedesktop.org/wlroots/wlroots/-/issues/3655

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