Updated image reference for cron job source example.

[matejvasek]

Fixes #2145

I changed image from gcr.io/knative-releases/github.com/knative/eventing-sources/cmd/event_display to gcr.io/knative-releases/knative.dev/eventing-contrib/cmd/event_display.

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[matejvasek]

@googlebot I signed it!

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[vaikas]

/ok-to-test

[matejvasek]

/assign @samodell

[samodell]

/lgtm
/approve

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This pull-request has been approved by: matejvasek, samodell

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