fa_iconpicker innerhalb von Repeater nicht möglich

**Description / Beschreibung**
Der fa_iconpicker funktioniert bei statischem Inhalt fehlerfrei. Innerhalb eines dynamischen Elementes also innerhalb vom Repeater funktioniert er allerdings nicht.

**Affected versions / Verwendete Versionen**

System report (REDAXO 5.18.0, PHP 8.2.24, MariaDB 10.6.19)

| REDAXO | |
| ------------: | :--------- |
| Version | 5.18.0 |

| PHP | |
| ------------: | :--------- |
| Version | 8.2.24 |
| OPcache | yes |
| Xdebug | no |

| Database | |
| ------------: | :-------------- |
| Version | MariaDB 10.6.19 |
| Character set | utf8mb4 |

| Server | |
| ------------: | :--------- |
| OS | FreeBSD |
| SAPI | cgi-fcgi |
| Webserver | Apache |

| Request | |
| ------------: | :--------------- |
| Browser | Chrome/129.0.0.0 |
| Protocol | HTTP/2.0 |
| HTTPS | yes |

| Packages | |
| ---------------------: | :--------- |
| backup | 2.9.1 |
| be_branding | 1.8.1 |
| be_style | 3.5.0 |
| be_style/customizer | 3.5.0 |
| be_style/redaxo | 3.5.0 |
| bloecks | 4.0.2 |
| bloecks/cutncopy | 4.0.2 |
| bloecks/dragndrop | 4.0.2 |
| cke5 | 6.1.0 |
| cronjob | 2.11.0 |
| developer | 3.9.2 |
| fa_iconpicker | 1.2.1 |
| flatpickr | 1.1.1 |
| global_settings | 2.8.4 |
| install | 2.12.1 |
| mblock | 3.4.13 |
| media_manager | 2.17.0 |
| mediapool | 2.15.0 |
| metainfo | 2.11.0 |
| mform | 8.0.4 |
| mform/docs | 1.1 |
| minify | 2.2.2 |
| modulsuche | 1.4.1 |
| multiupload | 2.1.3 |
| phpmailer | 2.14.0 |
| project | dev |
| project_manager | 1.5.3 |
| project_manager/client | 1.1.0 |
| project_manager/server | 1.5.1 |
| properties | 1.3.4 |
| quick_navigation | 8.1.3 |
| sprog | 1.5.1 |
| structure | 2.17.2 |
| structure/content | 2.17.2 |
| structure/history | 2.17.0 |
| structure_tweaks | 1.4.1 |
| url | 2.1.0 |
| users | 2.11.0 |
| yform | 4.2.1 |
| yform/email | 4.2.1 |
| yform/manager | 4.2.1 |
| yform_usability | 2.1.4 |
| yrewrite | 2.10.0 |

REDAXO:
PHP:
Database:
Browser:
AddOns:

### input.php

```
addTabElement('Inhalt', MForm::factory()
->addHTML('

Teasers

---

')
->addTextField("$idStatic.statisches_icon", ['label' => 'Fontawesome Icon', 'class' => 'rex-fa-iconpicker'])->setFull()
->addRepeaterElement(2, MForm::factory()
->addFieldsetArea('', MForm::factory()
->addHTML('

Teaser

---

')
->addTextField('text_header', ['label' => 'Überschrift'])->setFull()
->addTextField('dynamisches_icon', ['label' => 'Fontawesome Icon', 'class' => 'rex-fa-iconpicker'])->setFull()
) , true, true, ['btn_text' => 'Inhalt hinzufügen', 'max' => 99, 'min' => 1]
)
, true);

// Ausgabe des Formulars
echo $mformStatic->show();
```


### output.php
```

';
print_r($mformStatic);
echo '';

echo '

';

print_r($mformDynamic);

echo '

';
?>

```
ergibt

```
Array
(
[statisches_icon] => fa-calendar-days
)

Array
(
[0] => Array
(
[text_header] => Beratung
)

[1] => Array
(
[text_header] => Verschleiss­­ersatzteile
)

[2] => Array
(
[text_header] => Reklamation
)

)
```
Im dynamischen Inhalt ist der Key [dynamisches_icon] nirgendwo vorzufinden.