CI: hotfix in Jenkins pipeline script

Signed-off-by: Raphael Defosseux <raphael.defosseux@eurecom.fr>

ci-scripts/Jenkinsfile-gitlab

@@ -291,7 +291,7 @@ pipeline {
                                 copyArtifacts(projectName: 'eNB-CI-FDD-Band7-B210',
                                               filter: 'test_results*.html',
                                               selector: specific("${FDD_Band7_B210_Status.number}"))
-                                if (fileExist('test_results-eNB-CI-FDD-Band7-B210.html')) {
+                                if (fileExists('test_results-eNB-CI-FDD-Band7-B210.html')) {
                                     archiveArtifacts artifacts: 'test_results-eNB-CI-FDD-Band7-B210.html'
                                 }
                             }