fix: omnipool - dont allow sell/buy with same asset in/out

[enthusiastmartin]

Fixes issue #436

[github-actions[bot]]

Crate versions that have not been updated:

• pallet-omnipool: v1.0.0

Runtime version has not been increased.

[codecov[bot]]

Codecov Report

Merging #437 (6e26509) into feat/omnipool (20c8ac6) will increase coverage by 0.03%. The diff coverage is 100.00%.

@@                Coverage Diff                @@
##           feat/omnipool     #437      +/-   ##
=================================================
+ Coverage          86.77%   86.80%   +0.03%     
=================================================
  Files                  8        8              
  Lines                877      879       +2     
=================================================
+ Hits                 761      763       +2     
  Misses               116      116              

Impacted Files	Coverage Δ
pallets/omnipool/src/lib.rs	87.01% <100.00%> (+0.04%)	:arrow_up:

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