Unset user PHOTO before setting new one in OCA\DAV\CardDAV\Converter::updateCard (#26243)

Signed-off-by: Olivier Mehani <shtrom@ssji.net>

#26242

apps/dav/lib/CardDAV/Converter.php

@@ -92,6 +92,7 @@ class Converter {
 		}
 
 		if($this->propertyNeedsUpdate($vCard, 'PHOTO', $image)) {
+			unset($vCard->PHOTO);
 			$vCard->add('PHOTO', $image->data(), ['ENCODING' => 'b', 'TYPE' => $image->mimeType()]);
 			$updated = true;
 		}