CI: fix typo when removing temporary image

Signed-off-by: Raphael Defosseux <raphael.defosseux@openairinterface.org>

ci-scripts/Jenkinsfile-GitHub-Docker

@@ -417,7 +417,7 @@ pipeline {
         // Removing temporary / intermediate images
         try {
           if (env.ghprbPullId != null) {
-            myShCmd('docker image rm --force oai-spgwu:ci-temp', new_host_flag, new_host_user, new_host)
+            myShCmd('docker image rm --force oai-spgwu-tiny:ci-temp', new_host_flag, new_host_user, new_host)
           }
         } catch (Exception e) {
           echo "We failed to delete the OAI-SPGWU temp image"