vo_opengl: adjust the rules for linearization

Two changes, compounded into one since they affect the same logic:

1. Never use linearization for HDR downscaling
2. Always use linearization for interpolation

Instead of fixing p->use_linear at the beginning of pass_render_frame,
we flip it on "dynamically" as needed. I plan on killing this
p->use_linear frame (along with other per-pass metadata) and moving them
into their own struct for tracking the "current" state of the video, but
that's a separate/upcoming refactor.

As a small bonus, reduce some code duplication in the interpolation
logic.

Fixes #4631

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