Revert "Installation goes brrrr"

[ChristophWurst]

Reverts #24039

See https://github.com/nextcloud/mail/pull/4058/checks?check_run_id=1385547148.

As discussed with @nickvergessen

[faily-bot]

🤖 beep boop beep 🤖

Here are the logs for the failed build:

Status of 35394: failure

mariadb10.1-php7.3

Show full log

There was 1 error:

1) Test\Share20\DefaultShareProviderTest::testDeleteFromSelfGroupNoCustomShare
OCP\Share\Exceptions\ShareNotFound: There was an error retrieving the share. Maybe the link is wrong, it was unshared, or it was deleted.

/drone/src/lib/private/Share20/DefaultShareProvider.php:763
/drone/src/tests/lib/Share20/DefaultShareProviderTest.php:1468

--

There were 2 warnings:

1) Test\Files\ViewTest::testRenameFailDeleteTargetKeepSource
Trying to configure method "writeStream" which cannot be configured because it does not exist, has not been specified, is final, or is static

2) Test\Files\ViewTest::testCopyFailDeleteTargetKeepSource
Trying to configure method "writeStream" which cannot be configured because it does not exist, has not been specified, is final, or is static