Disable template handling, "<%" breaks beautify

[Rob--W]

The patch to #1377 breaks beautification when "<%" is present.

Template handling should be optional and preferably off by default (maybe on by default for HTML, but definitely off by default for JS).

Test case:

1. Visit https://beautifier.io/
2. Input "<%";if(0){}

Expected:

"<%";
if (0) {}

Actual:

"<%";if(0){}

This even happens if I set the dropdown to "Beautify JavaScript" to force beautification as JS rather than autodetect.

[bitwiseman]

Duplicate of #1647.