Inseriting numbers with a prefix reverses the string

[acataluddi]

Dear Max,

we found a bug in the component when a prefix is set (in our case, we set the £ sign as a prefix).

More specifically, by inserting a string or number, you get the reversed one (e.g let's say you type 125, the get 521).

This pull request fixes such problem.

Best regards, Adriano C.

[acataluddi]

Hi @nosir, is there any chance you might review and merge this merge request?

Thanks,
Adriano C.