johejo: fix json tag for SSLPreferServerCiphers

JobBuild
5853
07-06 15:01
pull-ingress-nginx-boilerplate 1280154785902759936
pull-ingress-nginx-codegen 1280154785906954240
pull-ingress-nginx-e2e-1-15 1280154785919537152
pull-ingress-nginx-e2e-1-16 1280154785936314368
pull-ingress-nginx-e2e-1-17 1280154785923731456
pull-ingress-nginx-e2e-1-18 1280154785932120064
pull-ingress-nginx-gofmt 1280154785902759937
pull-ingress-nginx-golint 1280155032703995904 1280154785923731457
pull-ingress-nginx-test 1280154785936314369