Token manager subgraph: Fix duplicated balances

[fabriziovigevani]

Fixes duplicated balances issue.

From the graph docs

The BigInt class has the following API:

Construction

BigInt.fromI32(x: i32): BigInt – creates a BigInt from an i32

I think when using new BigInt() the previousBlock had an unexpected value.

[codecov]

Codecov Report

Merging #75 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #75   +/-   ##
=======================================
  Coverage   28.15%   28.15%           
=======================================
  Files          53       53           
  Lines         863      863           
  Branches      146      146           
=======================================
  Hits          243      243           
  Misses        620      620           

Flag	Coverage Δ
#unittests	28.15% <ø> (ø)

Impacted Files	Coverage Δ
...kages/connect-thegraph-tokens/src/queries/index.ts
...onnect-thegraph-tokens/src/entities/TokenHolder.ts
...onnect-thegraph-tokens/src/parsers/tokenHolders.ts
...kages/connect-thegraph-tokens/src/parsers/index.ts
...nnect-thegraph-tokens/src/entities/TokenManager.ts
...ages/connect-thegraph-tokens/src/parsers/tokens.ts
packages/connect-thegraph-tokens/src/connector.ts
...nnect-thegraph-tokens/src/entities/TokensEntity.ts
...ages/connect-thegraph-tokens/src/entities/Token.ts
packages/connect-thegraph-tokens/src/index.ts
... and 10 more

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[bpierre]

LGTM, it seems to be the only case in the code base. Thanks Fabri 🙏