fix: allow unswept funds to be used in boost

[kylezs]

Pull Request

Closes: PRO-1547

Checklist

Please conduct a thorough self-review before opening the PR.

• I am confident that the code works.
• I have written sufficient tests
• I have written and tested required migrations.
• I have updated documentation where appropriate.

Summary

Figured this was easy enough to get in before 1.6.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 71%. Comparing base (6ec3507) to head (ecd3177).
Report is 1 commits behind head on main.

Files	Patch %	Lines
state-chain/pallets/cf-ingress-egress/src/lib.rs	0%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@          Coverage Diff           @@
##            main   #5164    +/-   ##
======================================
- Coverage     71%     71%    -0%     
======================================
  Files        458     458            
  Lines      82135   81992   -143     
  Branches   82135   81992   -143     
======================================
- Hits       58145   57941   -204     
- Misses     20920   20974    +54     
- Partials    3070    3077     +7     

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[dandanlen]

This will probably conflict with #5083 - would suggest adding it after that / branching off that PR.

[dandanlen]

(I rebased against main)