Revert change made for the 1.x branch only

Author: fabpot

src/Configurator/DockerComposeConfigurator.php

@@ -151,7 +151,7 @@ private function normalizeConfig(array $config): array
                 return ['compose.yaml' => $config];
             }
 
-            if (strncmp($key, 'docker-', 7)) {
+            if (!str_starts_with($key, 'docker-')) {
                 continue;
             }