Scan: Revamp undelegate, redelegate, withdraw reward, vote modal

[Pitchanai]

Fixed: #2733
Fixed: #2735
Fixed: #2736
Fixed: #2737

Implementation details

• Revamp undelegate modal
• Revamp redelegate modal
• Revamp withdraw reward modal
• Revamp vote modal

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• The pull request includes any and all appropriate unit/integration tests
• You have added a relevant changelog entry to CHANGELOG_UNRELEASED.md
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[evilpeach]

Looks good!