Allow multi-cursor to work properly for autoclose plugin

[Neko-Box-Coder]

If you have multi-cursors inside braces and perform newline, the autoclose won't act as expected.

abc
{|}

abc
{|}

abc
{|}

| are the cursors. Here's what happens after newline

abc
{
|   
}

abc
{|}

abc
{|}

The autoclose doesn't get run on each cursor, therefore only the first (primary) cursor works. This PR fixes that.