refactor modal tests

[fedekunze]

Description:

Part of #1337

Thank you! 🚀

---

For contributor:

• Added entries in PENDING.md with issue # and GitHub username
• Reviewed Files changed in the github PR explorer
• Attach screenshots of the UI components on the PR description (if applicable)
• Scope of work approved for big PRs

For reviewer:

• Manually tested the changes on the UI

[codecov]

Codecov Report

Merging #2317 into develop will decrease coverage by 0.04%.
The diff coverage is 100%.

@@             Coverage Diff             @@
##           develop    #2317      +/-   ##
===========================================
- Coverage    97.11%   97.07%   -0.05%     
===========================================
  Files          105      105              
  Lines         2326     2325       -1     
  Branches       127      127              
===========================================
- Hits          2259     2257       -2     
  Misses          57       57              
- Partials        10       11       +1

Impacted Files	Coverage Δ
.../src/renderer/components/staking/PageValidator.vue	100% <ø> (ø)	⬆️
.../renderer/components/staking/UndelegationModal.vue	100% <ø> (ø)	⬆️
...rc/renderer/components/governance/ModalPropose.vue	100% <100%> (ø)	⬆️
...rc/renderer/components/governance/ModalDeposit.vue	95.65% <0%> (-4.35%)	⬇️

[sabau]

Thanks man