Remove unnecessary check

Author: Takahiro-Yoko

modules/exploits/linux/local/cve_2023_0386_overlayfs_priv_esc.rb

@@ -87,12 +87,6 @@ def check
       return CheckCode::Safe("Linux kernel version #{kernel_version} is not vulnerable")
     end
 
-    unless kernel_config && kernel_config.include?('CONFIG_USER_NS=y')
-      return CheckCode::Safe('Kernel config does not include CONFIG_USER_NS=y')
-    end
-
-    vprint_good('Kernel config has CONFIG_USER_NS enabled')
-
     unless userns_enabled?
       return CheckCode::Safe('Unprivileged user namespaces are not permitted')
     end