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Duke3D: Camera vector smoothing rework causes jumpy frames

Video: https://cdn.discordapp.com/attachments/461290354726010891/866792924675178526/2021-07-19_23-24-31.mp4

Go to E1L1 in the area shown above, lower your FPS to 30, and circle-strafe around the poster. You will likely experience the same jumpiness as in the video.

This problem was introduced by commit a3dbdea4:

commit a3dbdea4ae65a2756df13d58bdc80a80ee0c5a3c (refs/bisect/bad)
Author: Richard C. Gobeille <richard@voidpoint.com>
Date:   Tue Apr 20 15:35:11 2021 -0700

    Duke3d: revise a359877b2a01182f06e1db910c660a654a0727a2

The commit in question fixes issue #100 (closed). Make sure that resolving this problem doesn't reintroduce that one.