Remove duplicate description in workflow input

Signed-off-by: Adam Poulemanos <89049923+bashandbone@users.noreply.github.com>

Author: bashandbone

.github/workflows/docker.yml

@@ -34,7 +34,6 @@ on:
   workflow_dispatch:
     inputs:
       update_description_only:
-        description: "Only update Docker Hub description (no build)"
         description: "Only update Docker Hub description (no build)"
         required: false
         type: boolean