FloatingField has unnecessary field.name as placeholder, placeholder isnt hidden

placeholder can be seen when floatingfield is closed, by default is field.name.

```
{% load crispy_forms_field %}

{% if field.is_hidden %}
{{ field }}
{% else %}
<{% if tag %}{{ tag }}{% else %}div{% endif %} id="div_{{ field.auto_id }}" class="form-floating mb-3{% if wrapper_class %} {{ wrapper_class }}{% endif %}{% if field.css_classes %} {{ field.css_classes }}{% endif %}">

{% if field|is_select %}
{%if field.errors %}
{% crispy_field field 'class' 'form-select is-invalid' 'placeholder' ' ' %}
{% else %}
{% crispy_field field 'class' 'form-select' 'placeholder' ' ' %}
{% endif %}
{% else %}
{% if field.errors %}
{% crispy_field field 'class' 'form-control is-invalid' 'placeholder' ' ' %}
{% else %}
{% crispy_field field 'class' 'form-control' 'placeholder' ' ' %}
{% endif %}
{% endif %}


{{ field.label }}{% if field.field.required %}*{% endif %}

{% include 'bootstrap5/layout/help_text_and_errors.html' %}

document.addEventListener('DOMContentLoaded', function() {
const employeeIdInput = document.getElementById('{{ field.auto_id }}');

if (employeeIdInput) {
employeeIdInput.addEventListener('focus', function() {
this.placeholder = '{{field.name}}';
});

employeeIdInput.addEventListener('blur', function() {
if (this.value === '') {
this.placeholder = ' ';
}
});
}
});

{% endif %}
``
```
^ scuffed band-aid fix for floatingfield