Merge #1990

1990: Fix roundcube sso login r=mergify[bot] a=Diman0

## What type of PR?

bug-fix

## What does this PR do?

It fixes SSO login for roundcube. PR #1966 added additional apache modules in the roundcube dockerfile. The additional rewrite module breaks the sso login. This PR removes the unused apache rewrite module.

### Related issue(s)
#1966 

## Prerequisites
Before we can consider review and merge, please make sure the following list is done and checked.
If an entry in not applicable, you can check it or remove it from the list.

- [ ] In case of feature or enhancement: documentation updated accordingly
- [x] Unless it's docs or a minor change: add [changelog](https://mailu.io/master/contributors/workflow.html#changelog) entry file.


Co-authored-by: Diman0 <diman@huisman.xyz>

towncrier/newsfragments/1990.bugfix

@@ -0,0 +1 @@
+Fixed roundcube sso login not working.

webmails/roundcube/Dockerfile

@@ -39,7 +39,7 @@ RUN apt-get update && apt-get install -y \
  && sed -i 's,^php_value.*upload_max_filesize,#&,g' .htaccess \
  && chown -R www-data: logs temp \
  && rm -rf /var/lib/apt/lists \
- && a2enmod rewrite deflate expires headers
+ && a2enmod deflate expires headers
 
 COPY php.ini /php.ini
 COPY config.inc.php /var/www/html/config/