Revert !8987
Context
Contrary to what we expected, the breaking change of MR !8987 (merged) (representation of liquidity baking EMA changed from int32 to int64) is actually not required by adaptive inflation so we revert it.
Manually testing the MR
Checklist
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Document the interface of any function added or modified (see the coding guidelines) -
Document any change to the user interface, including configuration parameters (see node configuration) -
Provide automatic testing (see the testing guide). -
For new features and bug fixes, add an item in the appropriate changelog ( docs/protocols/alpha.rstfor the protocol and the environment,CHANGES.rstat the root of the repository for everything else). -
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