fix: add eol in dav command and use success const as return code

Signed-off-by: GreyXor <[email protected]>

apps/dav/lib/Command/FixCalendarSyncCommand.php

@@ -54,7 +54,8 @@ public function execute(InputInterface $input, OutputInterface $output): int {
 			});
 			$progress->finish();
 		}
-		return 0;
+		$output->writeln('');
+		return self::SUCCESS;
 	}
 
 	private function fixUserCalendars(IUser $user, ?ProgressBar $progress = null): void {