Fix dev-env image name

[wayt]

What this PR does / why we need it:

This fixes a mismatch between Makefile MULTI_ARCH_IMAGE and DEV_IMAGE used in dev-env.sh

While running build/dev-env.sh, it builds the appropriate container using https://github.com/kubernetes/ingress-nginx/blob/master/build/dev-env.sh#L46

Then, it replaces the image name in deployment files https://github.com/kubernetes/ingress-nginx/blob/master/build/dev-env.sh#L68

But currently, DEV_IMAGE does not depend on ARCH.

Which issue this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close that issue when PR gets merged): fixes #

Special notes for your reviewer:

I'm a bit confused about why this hasn't been seen sooner.

Cc @ElvinEfendi

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: wayt
To complete the pull request process, please assign bowei
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[wayt]

/assign @bowei

[aledbf]

@ElvinEfendi is this still necessary?

[wayt]

I think Elvin's changes fixed that, we can close