Make sure tiles that runs outside the scale limits are removed

[thomasp85]

Fixes #3539

Prior to this tiles in geom_raster where not removed if they felt outside the scale limits resulting in a squeezing of the raster (it would keep all "pixels" but only occupy the area of the pixels inside the scale limits). This PR fixes it by updating the non_missing_aes field to include xmin, xmax, ymin, and ymax

[karawoo]

LGTM. Instead of squishing the image it drops the bottom row of tiles and warns about the removed data, which is the correct behavior.

dat <- expand.grid(x = seq(-2, 2, by = 1), y = seq(-2, 2, by = 1))
dat$val <- (1:nrow(dat))/nrow(dat)

ggplot() +
  geom_raster(data = dat, aes(x = x, y = y, fill = val)) +
  geom_hline(yintercept = 0) + geom_vline(xintercept = 0) +
  scale_x_continuous(limits = c(-2.5, 2.5)) + scale_y_continuous(limits = c(-2,2.5))
#> Warning: Removed 5 rows containing missing values (geom_raster).

^{Created on 2019-12-16 by the reprex package (v0.3.0)}