Fix configuration hash calculation

[aledbf]

Test image: quay.io/aledbf/nginx-ingress-controller:0.397

[aledbf]

@jpds this should fix the hash issue. Can you use the test image? Thanks

[jpds]

All values the same now!

[codecov-io]

Codecov Report

Merging #2776 into master will decrease coverage by 0.14%.
The diff coverage is 0%.

@@            Coverage Diff            @@
##           master   #2776      +/-   ##
=========================================
- Coverage   47.64%   47.5%   -0.15%     
=========================================
  Files          74      75       +1     
  Lines        5400    5402       +2     
=========================================
- Hits         2573    2566       -7     
- Misses       2503    2511       +8     
- Partials      324     325       +1

Impacted Files	Coverage Δ
internal/ingress/types.go	0% <0%> (ø)
cmd/nginx/main.go	20.39% <0%> (-4.61%)	⬇️

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[antoineco]

/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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