Update BasicCoin.move

[gftea]

Fix warnings

warning[W10007]: potential issue with attribute value
   ┌─ ./sources/BasicCoin.move:94:24
   │
94 │     #[expected_failure(abort_code = 2)] // Can specify an abort code
   │                        ^^^^^^^^^^   - Replace value with constant from expected module or add `location=...` attribute.
   │                        │             
   │                        WARNING: passes for an abort from any module.

Motivation

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Test Plan

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[gftea]

@wrwg wonder if anyone can review and approve workflow run