Update .github/workflows/check-backport-labels.yml

Author: flobernd

.github/workflows/check-backport-labels.yml

@@ -66,7 +66,7 @@ jobs:
                   major="${BASH_REMATCH[1]}"
                   minor="${BASH_REMATCH[2]}"
                   pr_majors+=("${major}")
-                  if [[ "${pr_label}" == *x ]]; then
+                  if [ "${minor}" = "x" ]; then
                     pr_floating_majors+=("${major}")
                   fi
                 fi