initialize the value as empty

In contact-form-cfdb7/inc/admin-subpage.php, around line 254, the code should initialize the value as empty. However, it currently only overwrites each value individually.

As a result, if one row has a value and the next row does not, the next row incorrectly inherits the data from the previous row.

Please add the following line at line 253:

$form_values = array();