Revert "Add a message about the workaround with MC 1.9"

This reverts commit aa914b9aa7f92300899957024123ddf0f49177f6.

src/main/java/fr/xephi/authme/AuthMe.java

@@ -242,8 +242,6 @@ public class AuthMe extends JavaPlugin {
         try {
             setupDatabase(newSettings);
         } catch (Exception e) {
-            ConsoleLogger.showError("If you are using CraftBukkit/Spigot 1.9 please add the "
-                + "-Dfile.encoding=UTF-8 argument in your server startup script!");
             ConsoleLogger.logException("Fatal error occurred during database connection! "
                 + "Authme initialization aborted!", e);
             stopOrUnload();