Fix bug in camera adding code which is fatal in PHP 8.2.0 (Ubuntu 23.10)

Was:

 #4 {main}                                                                                                                                                                                                              thrown in /usr/share/bluecherry/www/lib/lib.php on line 883" while reading response header from upstream, client: 192.168.86.151, server: , request: "POST /discover-cameras/add HTTP/1.1", upstream: "fastcgi://unix:/etc/alternatives/php-fpm.sock:", host: "192.168.86.115:7001"
 2024/07/10 19:10:06 [error] 279#279: *15 FastCGI sent in stderr: "
PHP message: PHP Warning:  Undefined array key "query" in /usr/share/bluecherry/www/ajax/discoverCameras.php on line 362;
PHP message: PHP Fatal error:  Uncaught Error: Non-static method ipCamera::checkLimitDevices() cannot be called statically in /usr/share/bluecherry/www/lib/lib.php:883
 Stack trace:
 #0 /usr/share/bluecherry/www/ajax/discoverCameras.php(381): ipCamera::create()
 #1 /usr/share/bluecherry/www/lib/Controller.php(119): discoverCameras->postAdd()
 #2 /usr/share/bluecherry/www/lib/Route.php(75): Controller->start()                                                                                                                                                  #3 /usr/share/bluecherry/www/index.php(16): Route->start()
 #4 {main}                                                                                                                                                                                                              thrown in /usr/share/bluecherry/www/lib/lib.php on line 883" while reading response header from upstream, client: 192.168.86.151, server: , request: "POST /discover-cameras/add HTTP/1.1", upstream: "fastcgi://unix:/etc/alternatives/php-fpm.sock:", host: "192.168.86.115:7001"

Became:

 2024/07/10 19:20:18 [error] 281#281: *21 FastCGI sent in stderr: "
PHP message: PHP Warning:  Undefined array key "query" in /usr/share/bluecherry/www/ajax/discoverCameras.php on line 362;
PHP message: PHP Warning:  Undefined array key "hls_segment_duration" in /usr/share/bluecherry/www/lib/lib.php on line 855;
PHP message: PHP Warning:  Undefined array key "hls_segment_size" in /usr/share/bluecherry/www/lib/lib.php on line 856;
PHP message: PHP Warning:  Trying to access array offset on value of type bool in /usr/share/bluecherry/www/lib/lib.php on line 861;
PHP message: PHP Warning:  Trying to access array offset on value of type null in /usr/share/bluecherry/www/lib/lib.php on line 861" while reading response header from upstream, client: 192.168.86.151, server: , request: "POST /discover-cameras/add HTTP/1.1", upstream: "fastcgi://unix:/etc/alternatives/php-fpm.sock:", host: "192.168.86.115:7001"

Both were processed with %s/PHP message:/^M&/g

www/lib/lib.php

@@ -933,7 +933,7 @@ public function changeState(){
 		if (!$this->info['disabled']) { self::autoConfigure($this->info['driver'], $this->info); }
 		return array(data::query("UPDATE Devices SET disabled=".(($this->info['disabled']) ? 0 : 1)." WHERE id={$this->info['id']}", true));
 	}
-	private function checkLimitDevices(){
+	private static function checkLimitDevices(){
 		$info = data::query("SELECT COUNT(*) as n FROM Devices WHERE protocol in ('IP-RTSP', 'IP-MJPEG', 'IP')");
 		$total_devices = $info[0]['n'];