fix(lib): remove duplicate zeroPad function

[antoineauger]

Hello there,

Thanks for maintaining this library.

We encounter some errors with the latest 2.2.0 release (transitive deps used by one of our tools) where the zeroPad function is duplicated:

...
[vite-plugin-pwa:build] Identifier 'zeroPad' has already been declared (123:9) in /app/node_modules/.pnpm/run-pace@2.2.0/node_modules/run-pace/lib/run-pace.js
file: /app/node_modules/.pnpm/run-pace@2.2.0/node_modules/run-pace/lib/run-pace.js:123:9
121: }
122: 
123: function zeroPad(number) {
              ^
124:   return `0${number}`.slice(-2);
125: }
...

I believe that this is a leftover of eeca7fa.

Could you please have a look here @Daghall? 🙏🏻

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