ci-dockerslaves-cleanup: Fix naming of x86-64-TF-06

Signed-off-by: Paul Sokolovsky <paul.sokolovsky@linaro.org>
Change-Id: I021ae76ffff2b3c1dcb9d71acec8dbac6feba4a3
diff --git a/ci-dockerslaves-cleanup.yaml b/ci-dockerslaves-cleanup.yaml
index ae90a38..db74af6 100644
--- a/ci-dockerslaves-cleanup.yaml
+++ b/ci-dockerslaves-cleanup.yaml
@@ -35,7 +35,7 @@
                 - x86_64-TF-03
                 - x86_64-TF-04
                 - x86_64-TF-05
-                - x86-TF-06
+                - x86-64-TF-06
     execution-strategy:
         sequential: false
     wrappers: