Fix provider usage

* do not send to appstore anymore
* do not set in getStatus/getConfig
* provider is not needed when registering cloudron

scripts/cloudron-setup

@@ -159,7 +159,7 @@ if [[ "${initBaseImage}" == "true" ]]; then
     echo ""
 fi
 
-# NOTE: this install script only supports 4.2 and above
+# The provider flag is still used for marketplace images
 echo "=> Installing version ${version} (this takes some time) ..."
 mkdir -p /etc/cloudron
 echo "${provider}" > /etc/cloudron/PROVIDER