:bug: fix ServiceUrlField constraint name

[codecov[bot]]

Codecov Report

Merging #57 (326db16) into main (a35a7a1) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #57   +/-   ##
=======================================
  Coverage   66.56%   66.56%           
=======================================
  Files          32       32           
  Lines        1334     1334           
  Branches      188      188           
=======================================
  Hits          888      888           
  Misses        395      395           
  Partials       51       51           

Impacted Files	Coverage Δ
zgw_consumers/models/fields.py	72.11% <ø> (ø)

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[annashamray]

@sergei-maertens I'm sorry but I can't make a correct constrained name form the first time