[stable18] Fix iLike() falsely turning escaped % and _ into wildcards

[backportbot-nextcloud]

backport of #23943

[faily-bot]

🤖 beep boop beep 🤖

Here are the logs for the failed build:

Status of 35363: failure

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mysql8.0-php7.2

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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

--

There was 1 failure:

1) Test\Files\Cache\Wrapper\CachePermissionsMaskTest::testGetById
null does not match expected type "array".

/drone/src/tests/lib/Files/Cache/CacheTest.php:498

[MorrisJobke]

🐘