TT#154353 fix JWT retrieval from the header

* fix variable assignment when the value is retrieved from the regex

Change-Id: I9f589b630bb2af85c64b41f163acdecffa418a59

lib/NGCP/Panel/Authentication/Credential/JWT.pm

@@ -49,7 +49,7 @@ sub authenticate {
         my $auth_header = $c->req->header('Authorization');
         return unless $auth_header;
 
-        $token = $auth_header =~ m/Bearer\s+(.*)/;
+        ($token) = $auth_header =~ m/Bearer\s+(.*)/;
         return unless $token;
     }