interlace: Don't set field-order field for progressive caps

That would cause negotiation issue

Part-of: <gstreamer/gst-plugins-bad!2293>
30 jobs for !2293 with backport-mr-2282-into-1.18-interlace-nego-fix in 45 minutes and 43 seconds (queued for 2 seconds)
detached
Status Name Job ID Coverage
  Build Docker
passed alpine amd64 manifest builder docker #10300924

00:00:12

passed android docker #10300923

00:00:12

passed cerbero fedora amd64 docker #10300922

00:00:48

passed fedora amd64 docker #10300921

00:00:57

passed gst-indent amd64 docker #10300925

00:00:57

 
  Preparation
passed gst indent #10300927

00:01:30

passed manifest #10300926

00:00:54

 
  Build
passed build cerbero cross-android universal #10300936
gstreamer

00:12:20

passed build cerbero cross-ios universal #10300940
gst-ios-14.3

00:31:59

passed build cerbero cross win32 #10300937
gstreamer

00:09:07

passed build cerbero cross win64 #10312639
gstreamer

00:07:37

passed build cerbero fedora x86_64 #10300935
gstreamer

00:05:02

passed build cerbero macos x86_64 #10300939
gst-macos-11.1

00:18:35

passed build clang fedora x86_64 #10300931

00:08:19

manual build msys2 #10300934
docker windows 1809 allowed to fail manual
passed build nodebug fedora x86_64 #10300928

00:07:36

passed build static fedora x86_64 #10300929

00:11:29

passed build static nodebug fedora x86_64 #10300930

00:11:06

passed build vs2017 amd64 #10300932
docker windows 1809

00:11:27

passed build vs2017 x86 #10300933
docker windows 1809

00:11:49

failed build cerbero cross win64 #10300938
gstreamer

00:04:18

 
  Test
passed check fedora #10300941
gstreamer

00:07:28

passed integration testsuites fedora 1/4 #10300942
gstreamer

00:09:09

passed integration testsuites fedora 2/4 #10300943
gstreamer

00:10:03

passed integration testsuites fedora 3/4 #10300944
gstreamer

00:07:26

passed integration testsuites fedora 4/4 #10300945
gstreamer

00:07:09

passed valgrind bad #10300946
gstreamer

00:05:41

 
  Integrate
passed cross-android universal examples #10300947

00:08:36

passed cross-ios universal examples #10300949
gst-ios-14.3

00:04:10

passed documentation #10300948

00:12:31