Don't filter top/left intra edge if intra_edge_filter=0

Fixes #236.
16 jobs for master in 5 minutes and 35 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Style
passed #248382
amd64 debian
style-check

00:00:18

 
  Build
passed #248383
amd64 debian
build-debian

00:00:34

passed #248390
debian aarch64
build-debian-aarch64

00:01:18

passed #248391
debian aarch64
build-debian-aarch64-clang-5

00:01:07

passed #248384
amd64 debian
build-debian-static

00:00:36

passed #248393
debian aarch64
build-debian-werror

00:00:33

passed #248385
amd64 debian
build-debian32

00:00:28

passed #248392
macos
build-macos

00:00:35

passed #248388
win32
build-win-arm32

00:00:25

passed #248389
win64
build-win-arm64

00:00:26

passed #248386
win32
build-win32

00:00:29

passed #248387
win64
build-win64

00:00:38

 
  Test
passed #248394
amd64 debian
test-debian

00:00:48

passed #248395
amd64 debian
test-debian-asan

00:02:04

passed #248396
amd64 debian
test-debian-msan

00:01:02

passed #248397
amd64 debian
test-debian-ubsan

00:01:24