fix(service): add missing '=' when invoking ko

[strieflin]

No description provided.

[codecov]

Codecov Report

Merging #59 (df38784) into master (2e1c776) will increase coverage by 0.27%.
The diff coverage is n/a.

Additional details and impacted files

@@             Coverage Diff              @@
##             master      #59      +/-   ##
============================================
+ Coverage     81.13%   81.40%   +0.27%     
- Complexity        0       24      +24     
============================================
  Files            29       34       +5     
  Lines          2936     3055     +119     
  Branches          0       10      +10     
============================================
+ Hits           2382     2487     +105     
- Misses          479      482       +3     
- Partials         75       86      +11     

Flag	Coverage Δ
java-client	85.71% <ø> (?)
service	81.23% <ø> (+0.10%)	⬆️

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see 6 files with indirect coverage changes

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