init scripts for rollapp registration need to be updated including gas prices in the transaction

[srene]

Describe the bug

The following error raw_log: 'no fees provided: insufficient fee' is received when running scripts/settlement/register_rollapp_to_hub.sh or scripts/settlement/register_sequencer_to_hub.sh scripts

To Reproduce
Steps to reproduce the behavior:
Follow readme instructions to register roll app in localhub
https://github.com/dymensionxyz/rollapp/tree/main#run-a-rollapp-with-local-settlement-node

Expected behavior
Tx completion

It is necessary to set --gas-prices when running the dymd tx commands