Turn off newline creation when autoclosing tags

Fixes #2547.

This is a CM v2-compatible version of the fix @jasonsanjose made in 5c32c30 to turn off newline creation when autoclosing an HTML tag. The name "closeTagIndent" is a bit of a misnomer--as far as I can tell, it's supposed to be a list of tags for which newlines are inserted (which also causes the close tag to be indented).