refactor prepare script, set manage_daemon to false if a custom host or port is set.

If the user sets the -COIN-_RPC_HOST or PORT variables manage_daemon will be set to false.
The -COIN-_MANAGE_DAEMON variable can override this and set manage_daemon directly.
if BSX_DOCKER_MODE is active -COIN-_MANAGE_DAEMON will default to false.

docker/production/compose-fragments/1_wownero-wallet.yml

@@ -7,7 +7,7 @@
         volumes:
             - ${DATA_PATH}/wownero_wallet:/data
         expose:
-            - ${BASE_WOW_WALLET_PORT}
+            - ${WOW_WALLET_RPC_PORT}
         logging:
             driver: "json-file"
             options: