fix: replace ; with & in salt delimiter for compatibility

Author: ovx

src/Altcha.php

@@ -154,7 +154,7 @@ public function verifySolution(string|array $data, bool $checkExpires = true): b
      */
     private function extractParams(Payload $payload): array
     {
-        $saltParts = explode('?', rtrim($payload->salt, ';'));
+        $saltParts = explode('?', $payload->salt);
         if (\count($saltParts) > 1) {
             parse_str($saltParts[1], $params);
 

src/BaseChallengeOptions.php

@@ -39,8 +39,8 @@ public function __construct(
         }
 
         // Add a delimiter to prevent parameter splicing
-        if (!str_ends_with($salt, ';')) {
-            $salt .= ';';
+        if (!str_ends_with($salt, '&')) {
+            $salt .= '&';
         }
 
         $this->salt = $salt;