fix(argo): remove orphan duplicate value key on spread-ticks parameter

train-template.yaml had a stray `value: "5"` line directly after
`value: "1.0"` under `- name: spread-ticks`. Stricter YAML parsers
(Go go-yaml used by kustomize) reject duplicate mapping keys and bail
out of the entire kustomize bundle with line-52 errors that mislead
diagnosis to unrelated files.

Permissive parsers (kubectl apply -f's path) silently take the last
value, which made the bug invisible until `kubectl apply -k` was
attempted.

The orphan was a leftover from an earlier edit (likely a max-folds=5
or similar parameter that was renamed but not fully removed).

infra/k8s/argo/train-template.yaml

@@ -11,7 +11,6 @@
 #   argo submit -n foxhunt --from=wftmpl/train
 #   argo submit -n foxhunt --from=wftmpl/train -p model=ppo -p train-epochs=100
 #   argo submit -n foxhunt --from=wftmpl/train -p hyperopt-trials=0   # skip hyperopt
----
 apiVersion: argoproj.io/v1alpha1
 kind: WorkflowTemplate
 metadata:
@@ -64,7 +63,6 @@ spec:
         value: "0.25"
       - name: spread-ticks
         value: "1.0"
-        value: "5"
       - name: sanitizer
         value: "none"  # "none", "memcheck", "racecheck", "synccheck"