Forms class leaves artefacts when creating select via an object

[Yabs]

Function select_input_object() [ approx 1623 ] creates invalid xhtml by leaving in a callback param 'loop_object_method'.

It can be corrected by unsetting the param after it's been used for purpose :

if( isset($field_params['loop_object_method']) )
{
 $field_options = $field_object->$field_object_callback( $field_value, $allow_none, $field_params['loop_object_method'] );
 unset( $field_params['loop_object_method'] );
}

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