Fix hardware accelerated rotation. #1450
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Also fix another bug where rotation was always set to 'clock' due to reading raw camera names instead of capitalizing them before accessing env variables.
I tested this on a vaapi-enabled machine but looking at the following snippet from
frigateffmpeg code, I'm confident that this change also fixes things forqsv:https://github.com/blakeblackshear/frigate/blob/6f9d9cd5a853b7c7cb4058ada8dccdca8cbc3f5b/frigate/ffmpeg_presets.py#L67-L68
Closes #1276