fix: hidden delegate dropdown on search

[alexbarnsley]

Overflow of ModalWindow is now hidden. This causes issues with anything inside the component, in this case, a dropdown menu. The fix only applies to the Delegate search modal.

Resolves #1459

Summary

Checklist

• Documentation (if necessary)
• Tests (if necessary)
• Ready to be merged

[codecov]

Codecov Report

Merging #1552 into develop will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           develop   #1552   +/-   ##
=======================================
  Coverage     45.7%   45.7%           
=======================================
  Files          274     274           
  Lines         6853    6853           
  Branches      1343    1343           
=======================================
  Hits          3132    3132           
  Misses        3559    3559           
  Partials       162     162

Impacted Files	Coverage Δ
...enderer/components/Wallet/WalletSelectDelegate.vue	37.5% <ø> (ø)	⬆️

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