fix(data-explorer): update count after removing row

[MaxPostema]

fixes: https://github.com/molgenis/molgenis-frontend/issues/596

Checklist

• [x] Functionality works & meets specifications
• [x] Code reviewed
• [x] Code unit/integration/system tested
• User documentation updated
• [x] Conventional commits (squash if needed)
• No warnings during install
• Updated javascript typing

[sonarcloud[bot]]

Kudos, SonarCloud Quality Gate passed!

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

0.0% Coverage
0.0% Duplication

[molgenis-jenkins]

:star: PR Preview available on https://preview-frontend-pr-610.dev.molgenis.org

[codecov[bot]]

Codecov Report

Merging #610 (df659aa) into master (079a291) will decrease coverage by 0.0%. The diff coverage is 66.6%.

@@           Coverage Diff            @@
##           master    #610     +/-   ##
========================================
- Coverage    90.0%   90.0%   -0.1%     
========================================
  Files         144     144             
  Lines        3377    3381      +4     
  Branches      501     471     -30     
========================================
+ Hits         3042    3044      +2     
- Misses        332     334      +2     
  Partials        3       3             

Flag	Coverage Δ
unit	90.0% <66.6%> (-0.1%)	:arrow_down:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...ages/data-explorer/src/store/explorer/mutations.ts	91.7% <0.0%> (-2.0%)	:arrow_down:
...ckages/data-explorer/src/store/explorer/actions.ts	100.0% <100.0%> (ø)

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