Fix TagList returning an object in array mode

[thienvu18]

After applying the array_filter method, the $value array lost its 0-based indexing, causing it to be treated as an object instead of an array. To resolve this, I’ve wrapped the result with array_values to reindex it and restore it as an array.

[mjauvin]

@thienvu18 the fix is valid.

I'm curious, did you get problems using it the way it was? If so, how?

[thienvu18]

@mjauvin thank for accepting my pr.

When I use this form widget for a json column in Postgres, the value is stored as {"1":"some_value"} instead of ["some_value"]. This makes whereJsonLength throw Invalid parameter value: 7 ERROR: cannot get array length of a non-array