motion: fix orientation of transform filter
The goal of the motion interface is to keep the video upside up. The angles of the rotate and transform filters are oriented in opposite directions, yet both filters are treated in the same way by the motion code: this is incoherent and at least one code path is wrong, regardless of the orientation of the motion sensors. On my HDAPS T42, the transform path would turn the video upside down... my take is that its orientation got flipped somewhere along the way. This fixes that.
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