[BUG] Table per page dropdown always defaults to first option even when set

[eligolding]

Describe the bug
When setting the pageConfig on a go-table, if you set the perPage to something other than the first option in the pageSizes array, the dropdown will still have the first option selected, even though the table will have the configured page count.

To Reproduce
Steps to reproduce the behavior:

1. Set perPage to something other than default:

this.tableConfig = new GoTableConfig({
  // ...stuffs
  pageConfig: {
    offset: 0,
    pageSizes: [25, 50, 100],
    perPage: 50, // second option
  },
});

2. Load the page in you browser de jour
3. See the unexpected results