Don't interpolate image input to quantizer

With `false`, nearest neighbor is used during scaling, with `true`,
bilinear interpolation is used. Bilinear interpolation can introduce
colors that weren't in the original image (ex. overemphasizing red/brown
highlights in a mostly B+W image of the Mandolorian). Better to avoid
that.

Bug: 189931209
Test: Test tons and tons of wallpapers over a couple days.
Change-Id: I425f95793ca593dbbc5008ef59f4baedaea318a6