Remove minimal images for gstreamer1-0-decode test case

Signed-off-by: Luis Araujo <luis.araujo@collabora.co.uk>

test-cases/gstreamer1-0-decode.yaml

@@ -2,7 +2,6 @@ metadata:
   name: gstreamer1-0-decode
   format: "Apertis Test Definition 1.0"
   image-types:
-    minimal: [ armhf-internal, armhf, arm64, amd64 ]
     target:  [ armhf-internal, amd64 ]
     basesdk: [ amd64 ]
     sdk:     [ amd64 ]