Revert "[lexer] leave open-mode on > so we don't parse <div>/>"

[kLabz]

This reverts commit b17bac7 which breaks inline markup with these kind of self-closing tags:

var a = <something onClick={e -> e.preventDefault()} />;
var b = <something isSelected={42 > 0} />;

[kLabz]

No idea why travis didn't pick this PR..
Anyway, travis build on my fork: https://travis-ci.org/kLabz/haxe/builds/543773078 (will fail for cs on linux because this branch is missing latest fix from RealyUniqueName)