bug: transactions hash and l1_data_gas_price mismatch with mainnet

[Ophiase]

Bug Report

The bug on transactions hash was introduced with #134
The bug with l1_data_gas_price mismatch was at least already there in #123

https://rpc-request-builder.voyager.online/

Using starknet_getBlockWithTxHashes, compare on block number 1 the json response over http://localhost:9944 and Mainnet (by clicking on Use default RPC URL)

The response Json from localhost should match with Mainnet.
Its partially working in #133 but not in #134

[Ophiase]

After further analysis, the problem doesn't seem to come from transactions.rs but lib.rs.
Remark: in #133 the block 0 can be requested, not in #134 (error generated from lib.rs "Block not found")

[Ophiase]

Fixed in #143