Enable post_write trigger

This is used when uploading a file with webdav. The trigger will add the file to the cache and make it show up in listings

lib/filesystemview.php

@@ -295,12 +295,12 @@ class OC_FilesystemView {
 							OC_Filesystem::signal_post_create,
 							array( OC_Filesystem::signal_param_path => $path)
 						);
-					}/*
+					}
 					OC_Hook::emit(
 						OC_Filesystem::CLASSNAME,
 						OC_Filesystem::signal_post_write,
 						array( OC_Filesystem::signal_param_path => $path)
-					);*/
+					);
 					OC_FileProxy::runPostProxies('file_put_contents', $absolutePath, $count);
 					return $count > 0;
 				}else{