fix(e2e): correct indentation of failureThreshold in readinessProbe YAML

YAML indentation was 2 levels deeper than siblings (14 spaces vs 12),
causing the key to be nested under httpGet instead of readinessProbe.
kubectl apply would silently accept this mis-structured manifest but
the probe configuration would be ignored at runtime.

PRI-907

Co-Authored-By: Paperclip <noreply@paperclip.ing>

scripts/deploy-e2e-headlamp.sh

@@ -124,7 +124,7 @@ spec:
               port: http
             initialDelaySeconds: 5
             periodSeconds: 5
-              failureThreshold: 6
+            failureThreshold: 6
           livenessProbe:
             httpGet:
               path: /