Fix/1622 proposal vote deadline fixes

[sam-keen]

Related issues 🔗

Closes #1622

Description ℹ️

Some intermittent proposal subscription errors were being seen when the 'use minimum' and 'use maximum' buttons were clicked. Investigation into this uncovered that the proposal form fields weren't updating the form state when the buttons were used.

Secondarily, we had been adding 2 mins of extra time to the proposal vote deadline when the minimum was set, but had hardcoded that it happen when the vote deadline was set to 1 hour. This PR changes it to be inline with the nearest rounded hour to the vote deadline from the network parameter for the proposal form type. This means proposal forms with min deadlines longer than 1 hour now also get the extra 2 mins added (without which proposal could error if the user spent some time confirming in their wallet).

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Test summary

70 • 0 • 5 • 0

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Run details

Project	frontend-monorepo
Status	Passed
Commit	0b990e53e8 ℹ️
Started	Oct 20, 2022 2:06 PM
Ended	Oct 20, 2022 2:09 PM
Duration	03:00 💡
OS	Linux Ubuntu - 20.04
Browser	Chrome 106

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