fix: use seen insstead of read flag

Signed-off-by: Sebastian Krupinski <krupinski01@gmail.com>

lib/Providers/Mail/MessageProperties.php

@@ -271,7 +271,7 @@ class MessageProperties extends MessagePropertiesMutableAbstract {
 			$this->data[static::PROPERTY_FLAGS] = [];
 			foreach ($parameters['keywords'] as $keyword => $value) {
 				$flag = match($keyword) {
-					'$seen' => 'read',
+					'$seen' => 'seen',
 					'$flagged' => 'flagged',
 					'$answered' => 'answered',
 					'$draft' => 'draft',
@@ -365,7 +365,7 @@ class MessageProperties extends MessagePropertiesMutableAbstract {
 			$parameters['keywords'] = [];
 			foreach ($this->data['flags'] as $flag => $value) {
 				$keyword = match($flag) {
-					'read' => '$seen',
+					'seen' => '$seen',
 					'flagged' => '$flagged',
 					'answered' => '$answered',
 					'draft' => '$draft',