Ignore users personal mimetype configs

[ayamshanov]

I think will be correct ignore personal mimetypes settings from config.

This setting use in /lib/private/files/type/detection.php:

grep -n '/mimetype........json' ./lib/private/files/type/detection.php

117:            if (file_exists($this->customConfigDir . '/mimetypealiases.json')) {
118:                    $custom = json_decode(file_get_contents($this->customConfigDir . '/mimetypealiases.json'), true);

142:            if (file_exists($this->customConfigDir . '/mimetypemapping.json')) {
143:                    $custom = json_decode(file_get_contents($this->customConfigDir . '/mimetypemapping.json'), true);

[mention-bot]

@ayamshanov, thanks for your PR! By analyzing the annotation information on this pull request, we identified @bantu, @DeepDiver1975 and @icewind1991 to be potential reviewers

[nickvergessen]

👍

[icewind1991]

👍