Folder: Don't add ignored files on startup

Before each sync is enough.
(We could do it at startup only, but so far it is good to have
it at each sync so we can easier see stuff in the log)

src/mirall/folder.cpp

@@ -123,7 +123,6 @@ bool Folder::init()
 
         MirallConfigFile cfgFile;
 
-        setIgnoredFiles();
         if (Account *account = AccountManager::instance()->account()) {
             account->credentials()->syncContextPreInit(_csync_ctx);
         } else {