clean: remove redundant `generateRound === 0` check

[agilgur5]

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Summary

Removes the if (generateRound === 0) check in the options hook as it is redundant / unnecessary

• Related to, but independent of, #390

Details

• when options is called, generateRound should have already been reset to 0, so this is redundant / unnecessary

  • options is only called once per watch cycle
  • options is also an input hook, not an output hook, i.e. it's only called once for all outputs, not per each output
    • generateRound only tracks the output round

• this might be leftover historical remnants prior to Rollup officially separating output hooks, but even before then, it should only have been called once for all outputs

  • since, per the Rollup API, it's only called during rollup.rollup and not during bundle.generate etc
  • c.f. old docs https://github.com/rollup/rollup/blob/v1.18.0/docs/05-plugin-development.md#options
  • it's possible this is even older, but I couldn't find plugin docs for Rollup pre-1.0 to try to confirm against