fix rows_per_page error

[cssailing]

fix the error of rows_per_page select all option value -1
option === -1

[MicroDroid]

I haven't tested the fork yet but what does this exactly fix? I suppose this merely breaks the component instead of fixing anything. 🤔

[cssailing]

when you have select the option all, the option value will be -1, fixed the value option as
:value="option === -1 ? rows.length : option"
make the all select work

[cssailing]

you can view the demo-Custom pagination table, select show all, report errors

[MicroDroid]

Alright I'll check this out in a moment.

[MicroDroid]

Thanks for your effort in making this PR, however, I opted into a slightly different solution to cover some other edge cases that can occur in the 5e2d1ae

🎉