Revert "Dovecot: Add IMAP capabilities."

This reverts commit 1bc33d5d.

dovecot/patch.diff

@@ -196,15 +196,6 @@
  # namespace settings, you can do it by defining namespace sections.
 --- conf.d/20-imap.conf	2020-12-22 13:26:52.000000000 +0000
 +++ conf.d/20-imap.conf	2022-12-05 07:33:47.876334736 +0000
-@@ -35,7 +35,7 @@
- 
- # Override the IMAP CAPABILITY response. If the value begins with '+',
- # add the given capabilities on top of the defaults (e.g. +XFOO XBAR).
--#imap_capability = 
-+imap_capability = +I18NLEVEL=1 SORT=DISPLAY THREAD=ORDEREDSUBJECT THREAD=REFERENCES CONTEXT=SEARCH
- 
- # How long to wait between "OK Still here" notifications when client is
- # IDLEing.
 @@ -95,5 +95,5 @@
  
    # Maximum number of IMAP connections allowed for a user from each IP address.