When you're in a situation like this, just compare the plugin file to the unmodified file from a fresh download.
Here's ./includes/templates/YOUR_TEMPLATE/templates/tpl_modules_address_book_details.php (less than sign) vs unmodified file (greater than sign):

< <?php echo zen_draw_input_field('company', $entry->fields['entry_company'], zen_set_field_length(TABLE_ADDRESS_BOOK, 'entry_company', '40') . ' autocomplete="new-password" id="company" placeholder="' . ENTRY_COMPANY_TEXT . '"' . (ACCOUNT_COMPANY == 'true' && (int)ENTRY_COMPANY_MIN_LENGTH != 0 ? ' required' : '')); ?>
---
> <?php echo zen_draw_input_field('company', $entry->fields['entry_company'], zen_set_field_length(TABLE_ADDRESS_BOOK, 'entry_company', '40') . ' id="company" placeholder="' . ENTRY_COMPANY_TEXT . '"' . (ACCOUNT_COMPANY == 'true' && (int)ENTRY_COMPANY_MIN_LENGTH != 0 ? ' required' : '')); ?>

Heres' ./includes/templates/YOUR_TEMPLATE/templates/tpl_modules_create_account.php vs unmodified file

< <?php echo zen_draw_input_field('company', '', zen_set_field_length(TABLE_ADDRESS_BOOK, 'entry_company', '40') . ' autocomplete="new-password" id="company" placeholder="' . ENTRY_COMPANY_TEXT . '"'. (ACCOUNT_COMPANY == 'true' && (int)ENTRY_COMPANY_MIN_LENGTH != 0 ? ' required' : '')); ?>
---
> <?php echo zen_draw_input_field('company', '', zen_set_field_length(TABLE_ADDRESS_BOOK, 'entry_company', '40') . ' id="company" placeholder="' . ENTRY_COMPANY_TEXT . '"'. (ACCOUNT_COMPANY == 'true' && (int)ENTRY_COMPANY_MIN_LENGTH != 0 ? ' required' : '')); ?>