fix: add hover style to dropdown toggle

[fdlk]

Checklist

• [ ] Functionality works & meets specifications
• [ ] Code reviewed
• [ ] Code unit/integration/system tested
• [ ] User documentation updated
• [ ] Clean commits
• [ ] No warnings during install
• [ ] Added Feature/Fix to release notes

[codecov[bot]]

Codecov Report

Merging #68 into master will not change coverage. The diff coverage is n/a.

@@          Coverage Diff           @@
##           master     #68   +/-   ##
======================================
  Coverage    89.1%   89.1%           
======================================
  Files          12      12           
  Lines         101     101           
  Branches       13      13           
======================================
  Hits           90      90           
  Misses         11      11

Flag	Coverage Δ
#unit	89.1% <ø> (ø)	:arrow_up:

Impacted Files	Coverage Δ
src/components/NavBar.vue	82.5% <ø> (ø)	:arrow_up:

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[molgenis-jenkins]

:tada: This PR is included in version 1.3.2 :tada:

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot :package::rocket: