Fix toLowercase in fileExists check for literature and message files

fixes #2245

src/Server/BaseServer.ts

@@ -58,9 +58,6 @@ export class BaseServer {
   maxRam = 0;
 
   // Message files AND Literature files on this Server
-  // For Literature files, this array contains only the filename (string)
-  // For Messages, it contains the actual Message object
-  // TODO Separate literature files into its own property
   messages: string[] = [];
 
   // Name of company/faction/etc. that this server belongs to.