Fix missing Default (TxBuilderStrategy m) constraint on GYTxBuilderMonad

[TotallyNotChase]

Summary

Very small change. I removed this constraint in a previous commit as part of #322 thinking it's redundant. But that's not correct since most use cases don't care about choosing a strategy when building transactions. So most use sites will just require a verbose Default (TxBuilderStrategy m) constraint on top. This improves upon that.

Type of Change

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• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Code refactoring (improving code quality without changing its behavior)
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Checklist

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• I have read the Contributing Guide
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• I have added tests to cover my changes
• All new and existing tests pass
• I have updated the documentation, if necessary

Testing

Additional Information

[sourabhxyz]

Thanks, LGTM!

[4TT1L4]

LGTM!

Thanks for the PR!