Use save parameters as encoderinfo defaults

[radarhere]

Resolves #8963. Alternative to #8974

Originally, additional im.save() parameters were applied to every frame when saving.

Then, #8483 added a generic way to set specific options when saving subsequent frames - with the user setting encoderinfo on subsequent frames. This meant that subsequent frames no longer used additional save parameters.

However, #8963 would like frames to default to the save parameters. Also worth considering is that within that scenario, someone might set encoderinfo on the first frame, so that the save parameters apply to all frames except the first one.