Account for padh_align when doing lowres WP

lowres[0] is shifted by additional padh_align pixels relative to buffer_lowres
and in case of AVX512 it might be greater than zero. Thus pointer of WP plane
points to incorrect location, which is then passed to ME.
10 jobs for avx512-lowres-wp in 10 minutes and 7 seconds (queued for 1 second)
latest
Status Job ID Name Coverage
  Build
passed #386283
aarch64 docker
build-debian-aarch64

00:07:12

passed #386282
amd64 docker
build-debian-amd64

00:01:25

passed #386286
macos
build-macos

00:01:52

passed #386284
amd64 docker
build-win32

00:02:06

passed #386285
amd64 docker
build-win64

00:03:37

 
  Test
passed #386288
aarch64 docker
test-debian-aarch64

00:00:24

passed #386287
amd64 docker
test-debian-amd64

00:00:47

passed #386291
macos
test-macos

00:00:04

passed #386289
amd64 docker
test-win32

00:00:45

passed #386290
amd64 docker
test-win64

00:00:55