dovecot version
v2.2.29
v2.2.36
v2.3.5
LIST "" * The returned mailbox does not display quotes
v2.1.17
LIST "" * The returned mailbox shows quotation marks
Why is the quotation mark removed in the new version?

Because they were unnecessary. The code was changed to use more generic IMAP token writer, which adds quotes only as necessary.

Is there any configuration option in the new version to add quotes?

No. Does it break some client?