ag-grid-solid: Run onMount before createEffect

[sin-ack]

Otherwise we access gridOptions before it's assigned.

[StephenCooper]

Hi @sin-ack,

Thanks for this. Do you think you could provide a reproduction of this issue so that we can validate your changes?

[sin-ack]

Sure, here's a StackBlitz example where the issue is exhibited: https://stackblitz.com/edit/solidjs-templates-iyvhby?file=src%2FApp.tsx

You should see "Error!" in the output window, and the error message will be printed to the console.

I couldn't reproduce it at first, but the specific issue seems to be with putting columnDefs behind a function (we need this in our project for i18n). If I use static columnDefs then the issue isn't exhibited. I'll look into it further tomorrow to see why this is the case.