Add pre_recorded_policy to proposal update form

[uranusjr]

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• [x] Bugfix
• [ ] New feature
• [ ] Refactoring
• [ ] Breaking change (any change that would cause existing functionality to not work as expected)
• [ ] Documentation Update
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Description

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This field is essential to make the update form submittable. https://discord.com/channels/752904426057892052/753841328198254642/955417991409975306

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[codecov-commenter]

Codecov Report

Merging #1062 (96607a3) into master (3fd47db) will increase coverage by 0.03%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1062      +/-   ##
==========================================
+ Coverage   69.26%   69.29%   +0.03%     
==========================================
  Files          82       82              
  Lines        3302     3306       +4     
==========================================
+ Hits         2287     2291       +4     
  Misses       1015     1015              

Impacted Files	Coverage Δ
src/proposals/forms/proposals.py	100.00% <100.00%> (ø)

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