Fixes issue with extrinsics named "call"

[leonardocustodio]

This fixes issue #383

[codecov]

Codecov Report

Attention: 4 lines in your changes are missing coverage. Please review.

Comparison is base (900ecf8) 46.99% compared to head (f80f9ee) 46.98%.

❗ Current head f80f9ee differs from pull request most recent head 86aa00a. Consider uploading reports for the commit 86aa00a to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #392      +/-   ##
==========================================
- Coverage   46.99%   46.98%   -0.02%     
==========================================
  Files         164      164              
  Lines        8911     8914       +3     
==========================================
  Hits         4188     4188              
- Misses       4723     4726       +3     

Flag	Coverage Δ
polkadart	17.01% <ø> (ø)
polkadart_cli	12.05% <0.00%> (-0.02%)	⬇️
polkadart_keyring	77.24% <ø> (ø)
polkadart_scale_codec	54.93% <ø> (ø)
sr25519	85.91% <ø> (ø)
ss58	96.87% <ø> (ø)
substrate_bip39	63.35% <ø> (ø)
substrate_metadata	87.61% <ø> (ø)

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Files	Coverage Δ
...ckages/polkadart_cli/lib/src/generator/pallet.dart	0.00% <0.00%> (ø)