Do not remove labels when pressing enter key in the label form

[maciaszczykm]

What this PR does / why we need it: The behavior was invalid because the delete button was by default acting like submit button. Adding type "button" to it fixes the issue.

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #2891

Special notes for your reviewer:

Release note:

Fixed the bug with labels that were removed from form after pressing enter key.

[kubermatic-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: maciaszczykm

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• OWNERS [maciaszczykm]

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[maciaszczykm]

/assign @floreks

[floreks]

/lgtm

[kubermatic-bot]

LGTM label has been added.

Git tree hash: 9bccca1b813142c58b7b2c977323081a0343bb5e

[codecov]

Codecov Report

Merging #2903 (885b636) into master (20c31de) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #2903   +/-   ##
=======================================
  Coverage   52.39%   52.39%           
=======================================
  Files         237      237           
  Lines        8201     8201           
  Branches      985      985           
=======================================
  Hits         4297     4297           
  Misses       3901     3901           
  Partials        3        3           

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