Enable master docs update workflow always

There seems to be no way to make the check work, and Actions are disabled
in forks by default anyways.

.github/workflows/update-master-docs.yml

@@ -17,7 +17,6 @@ on:
 
 jobs:
   build:
-    if: secrets.SSH_KEY_SECRET != ''
     runs-on: ubuntu-18.04
     steps:
       - name: Checkout rgbds@master