Account for framerate changes in custom lists

[LightArrowsEXE]

Some presets may change the framerate (for example, by deinterlacing 60i -> 60p). Right now, the custom list does not account for this.

cl_qtgmc = preset_qtgmc(src)
src = c.std.Splice(mismatch=True, clips=[src[0:30549],cl_qtgmc[30549:33245],src[33245:]])

In this example, cl_qtgmc is 60p, but it still trims assuming a 60i/30 fps input. If this behaviour can be resolved, handling 60p content in wobbly will become a lot more feasible.