Fix type hints regressions (#4855)

Fix regressions from https://github.com/FreshRSS/FreshRSS/pull/4561

Example:

```
PHP Fatal error:  Uncaught TypeError: Argument 1 passed to checkToken() must be an instance of FreshRSS_UserConfiguration, instance of Minz_Configuration given, called in /var/www/FreshRSS/p/api/greader.php on line 1091 and defined in /var/www/FreshRSS/p/api/greader.php:223
Stack trace:
#0 /var/www/FreshRSS/p/api/greader.php(1091): checkToken()
#1 {main}
  thrown in /var/www/FreshRSS/p/api/greader.php on line 223
```

Improvement of https://github.com/FreshRSS/FreshRSS/pull/4110

1 files changed, 2 insertions, 6 deletions

diff --git a/app/install.php b/app/install.php
index 9d0d855b8..48f39d25e 100644
--- a/app/install.php
+++ b/app/install.php
@@ -283,11 +283,7 @@ function freshrss_already_installed() {
 	// A configuration file already exists, we try to load it.
 	$system_conf = null;
 	try {
-		Minz_Configuration::register('system', $conf_path);
-		/**
-		 * @var FreshRSS_SystemConfiguration $system_conf
-		 */
-		$system_conf = Minz_Configuration::get('system');
+		$system_conf = FreshRSS_SystemConfiguration::init($conf_path);
 	} catch (Minz_FileNotExistException $e) {
 		return false;
 	}
@@ -295,7 +291,7 @@ function freshrss_already_installed() {
 	// ok, the global conf exists… but what about default user conf?
 	$current_user = $system_conf->default_user;
 	try {
-		Minz_Configuration::register('user', join_path(USERS_PATH, $current_user, 'config.php'));
+		FreshRSS_UserConfiguration::init(USERS_PATH . '/' . $current_user . '/config.php');
 	} catch (Minz_FileNotExistException $e) {
 		return false;
 	}