Remove files_texteditor from shipped apps

[juliusknorr]

I just checked if text app is there, not if the old one was removed, so with this the update process will work just fine since the app is not marked as shipped anymore:

server/lib/base.php

Lines 383 to 393 in 5898e87

	foreach ($incompatibleApps as $appInfo) {
	if ($appManager->isShipped($appInfo['id'])) {
	$incompatibleShippedApps[] = $appInfo['name'] . ' (' . $appInfo['id'] . ')';
	}
	}
	if (!empty($incompatibleShippedApps)) {
	$l = \OC::$server->getL10N('core');
	$hint = $l->t('The files of the app %1$s were not replaced correctly. Make sure it is a version compatible with the server.', [implode(', ', $incompatibleShippedApps)]);
	throw new \OC\HintException('The files of the app ' . implode(', ', $incompatibleShippedApps) . ' were not replaced correctly. Make sure it is a version compatible with the server.', $hint);
	}

Fixes the update issue described in nextcloud/files_texteditor#169 (comment)