Prevent community spend proposal from transferring funds to a ModuleAcc

[fedekunze]

• Targeted PR against correct branch (see CONTRIBUTING.md)

• Linked to github-issue with discussion and accepted design OR link to spec that describes this work.

• Wrote tests

• Updated relevant documentation (docs/)

• Added a relevant changelog entry: clog add [section] [-t <tag>] [-m <msg>]

• Re-reviewed Files changed in the github PR explorer

---

For Admin Use:

• Added appropriate labels to PR (ex. wip, ready-for-review, docs)
• Reviewers Assigned
• Squashed all commits, uses message "Merge pull request #XYZ: [title]" (coding standards)

[codecov]

Codecov Report

Merging #4831 into master will decrease coverage by 0.01%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master    #4831      +/-   ##
==========================================
- Coverage    54.2%   54.18%   -0.02%     
==========================================
  Files         269      269              
  Lines       17189    17191       +2     
==========================================
- Hits         9317     9315       -2     
- Misses       7182     7186       +4     
  Partials      690      690

[alexanderbez]

ACK ☕️