Set proxy-buffer-size to back to 16k (was temporary set to 32k to allow large response headers)

[emirgens]

Set proxy-buffer-size back to 16k in radix-flux (

radix-flux/components/third-party/ingress-nginx/chart/helmRelease.yaml

Line 48 in eccdbaa

proxy-buffer-size: "32k" # See https://stackoverflow.com/a/40306737 for a great explanation

)

Requires https://github.com/equinor/radix/issues/323 to be released. Inform Zulfeekar Cheriyampurath that he must configure this setting in radixconfig.yaml for his app before we deploy the change in flux

This reverts the temporary change in #2456