fix: sweep broke lp returned events

[AlastairHolmes]

No description provided.

[codecov]

Codecov Report

Merging #4176 (df3e865) into main (f812372) will increase coverage by 0%.
Report is 7 commits behind head on main.
The diff coverage is 74%.

@@          Coverage Diff          @@
##            main   #4176   +/-   ##
=====================================
  Coverage     72%     72%           
=====================================
  Files        380     379    -1     
  Lines      61591   61667   +76     
  Branches   61591   61667   +76     
=====================================
+ Hits       44174   44241   +67     
- Misses     15119   15135   +16     
+ Partials    2298    2291    -7     

Files	Coverage Δ
state-chain/pallets/cf-pools/src/benchmarking.rs	100% <100%> (ø)
state-chain/pallets/cf-pools/src/tests.rs	99% <100%> (ø)
state-chain/traits/src/mocks/lp_balance.rs	32% <ø> (ø)
api/lib/src/lp.rs	0% <0%> (ø)
state-chain/pallets/cf-pools/src/lib.rs	61% <82%> (+2%)	⬆️

... and 18 files with indirect coverage changes

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