Corrected indentation to ignore unmatched quotes inside comments

[stoffus]

It seems the indentation logic is purely based on { and }, without taking the lines containing TEMPLATE_BRACKET_OPENING_TAG and TEMPLATE_BRACKET_CLOSING_TAG into consideration.

Unmatched quotes inside comments breaks the indentation.

Without the changes in this PR, blocks like this:

server {
    # My comment with an unmatched '
    location / {
        root /var/www/foo;
    }
}

will be transformed into this:

server {
    # My comment with an unmatched '
    location / {
    root /var/www/foo;
    }
}