Fix debug_enabled workflow input

Author: WVerlaek

.github/workflows/ci.yml

@@ -16,7 +16,7 @@ on:
       debug_enabled:
         description: 'To run with tmate enter "debug_enabled"'
         required: false
-        default: "false"
+        default: ""
 
 env:
   DOCKER_CLI_VERSION: "20.10.17"