Fix typo in DAV namespace registration

See https://github.com/nextcloud/3rdparty/blob/b0afba6d6508a1c85332cf8c61e90ad91b289ebc/sabre/dav/lib/DAV/Xml/Service.php#L43

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

Author: tcitworld

apps/dav/lib/Connector/Sabre/SharesPlugin.php

@@ -98,7 +98,7 @@ public function __construct(
 	 * @param \Sabre\DAV\Server $server
 	 */
 	public function initialize(\Sabre\DAV\Server $server) {
-		$server->xml->namespacesMap[self::NS_OWNCLOUD] = 'oc';
+		$server->xml->namespaceMap[self::NS_OWNCLOUD] = 'oc';
 		$server->xml->elementMap[self::SHARETYPES_PROPERTYNAME] = ShareTypeList::class;
 		$server->protectedProperties[] = self::SHARETYPES_PROPERTYNAME;
 		$server->protectedProperties[] = self::SHAREES_PROPERTYNAME;

build/psalm-baseline.xml

@@ -760,12 +760,6 @@
     <UndefinedFunction occurrences="1">
       <code>\Sabre\Uri\split($sabreNode-&gt;getPath())</code>
     </UndefinedFunction>
-    <UndefinedPropertyAssignment occurrences="1">
-      <code>$server-&gt;xml-&gt;namespacesMap</code>
-    </UndefinedPropertyAssignment>
-    <UndefinedPropertyFetch occurrences="1">
-      <code>$server-&gt;xml-&gt;namespacesMap</code>
-    </UndefinedPropertyFetch>
   </file>
   <file src="apps/dav/lib/Connector/Sabre/TagsPlugin.php">
     <NullableReturnStatement occurrences="1">