chore(dav): Remove short function closure syntax not supported in PHP 7.3

Signed-off-by: Côme Chilliet <come.chilliet@nextcloud.com>

apps/dav/lib/SystemTag/SystemTagsRelationsCollection.php

@@ -87,7 +87,9 @@ class SystemTagsRelationsCollection extends SimpleCollection {
 				$userSession,
 				$groupManager,
 				$entityExistsFunction,
-				fn ($name) => true,
+				function ($name) {
+					return true;
+				},
 			);
 		}
 

apps/dav/tests/unit/SystemTag/SystemTagMappingNodeTest.php

@@ -62,7 +62,9 @@ class SystemTagMappingNodeTest extends \Test\TestCase {
 			$this->user,
 			$this->tagManager,
 			$this->tagMapper,
-			fn ($id): bool => in_array($id, $writableNodeIds),
+			function ($id) use ($writableNodeIds): bool {
+				return in_array($id, $writableNodeIds);
+			},
 		);
 	}
 

apps/dav/tests/unit/SystemTag/SystemTagsObjectMappingCollectionTest.php

@@ -58,7 +58,9 @@ class SystemTagsObjectMappingCollectionTest extends \Test\TestCase {
 			$this->user,
 			$this->tagManager,
 			$this->tagMapper,
-			fn ($id): bool => in_array($id, $writableNodeIds),
+			function ($id) use ($writableNodeIds): bool {
+				return in_array($id, $writableNodeIds);
+			},
 		);
 	}