Fix typo

Co-authored-by: Valdnet <[email protected]>

Author: skjnldsv

lib/base.php

@@ -258,7 +258,7 @@ public static function checkConfig() {
 				OC_Template::printErrorPage(
 					$l->t('Cannot write into "config" directory!'),
 					$l->t('This can usually be fixed by giving the webserver write access to the config directory.') . ' '
-					. $l->t('Or, if you prefer to keep config.php file read only, set the option "config_is_read_only" to true in it.') . ' '
+					. $l->t('But, if you prefer to keep config.php file read only, set the option "config_is_read_only" to true in it.') . ' '
 					. $l->t('See %s', [ $urlGenerator->linkToDocs('admin-config') ]),
 					503
 				);