prow.sh: remove obsolete test suppression

The "different node" test was fixed in Kubernetes long ago enough that
we no longer need to suppress it in prow.sh.

prow.sh

@@ -354,11 +354,7 @@ configvar CSI_SNAPSHOTTER_VERSION "$(default_csi_snapshotter_version)" "external
 # whether they can run with the current cluster provider, but until
 # they are, we filter them out by name. Like the other test selection
 # variables, this is again a space separated list of regular expressions.
-#
-# "different node" test skips can be removed once
-# https://github.com/kubernetes/kubernetes/pull/82678 has been backported
-# to all the K8s versions we test against
-configvar CSI_PROW_E2E_SKIP 'Disruptive|different\s+node' "tests that need to be skipped"
+configvar CSI_PROW_E2E_SKIP 'Disruptive' "tests that need to be skipped"
 
 # This creates directories that are required for testing.
 ensure_paths () {