Fix image for event generator deployment yaml

I had a bug in #1088 where
the image name for the event generator was pointing to a temporary tag
instead of latest. This switches the image name back to latest.

Signed-off-by: Mark Stemm <mark.stemm@gmail.com>

docker/event-generator/event-generator-k8saudit-deployment.yaml

@@ -18,6 +18,6 @@ spec:
       serviceAccount: falco-event-generator
       containers:
       - name: falco-event-generator
-        image: falcosecurity/falco-event-generator:eg-sandbox
+        image: falcosecurity/falco-event-generator
         imagePullPolicy: Always
         args: ["k8s_audit"]