chore: drop use of task var in test mock

I think this worked before, but it surprised Johnny in code review.

Better to keep it simple and unsurprising. The "*" should work too.

Signed-off-by: Ralph Bean <rbean@redhat.com>

tasks/create-pyxis-image/tests/mocks.sh

@@ -9,7 +9,7 @@ function create_container_image() {
   # e.g. 0001, 0002, 0003...
   echo The image id is $(awk 'END{printf("%04i", NR)}' $(workspaces.data.path)/mock_create_container_image.txt)
 
-  if [[ "$*" != "--pyxis-url https://pyxis.preprod.api.redhat.com/ --certified false --tags "*" --is-latest false --verbose --oras-manifest-fetch ${MANIFEST_FILE} --name "*" --media-type my_media_type+gzip --digest "*" --architecture-digest "*" --architecture "*" --rh-push "* ]]
+  if [[ "$*" != "--pyxis-url https://pyxis.preprod.api.redhat.com/ --certified false --tags "*" --is-latest false --verbose --oras-manifest-fetch "*" --name "*" --media-type my_media_type+gzip --digest "*" --architecture-digest "*" --architecture "*" --rh-push "* ]]
   then
     echo Error: Unexpected call
     echo Mock create_container_image called with: $*