undo some unnecessary int type casts

[arvidn]

Purpose:

In recent changes to transition python classes to rust types, rust's python bindings exposed all integers as plain python int, requiring explicit casts in the python code.

Now that rust's python bindings expose integer types as the correct fixed-width integer type, these type casts are unnecessary.

Current Behavior:

We have unnecessary type casts.

New Behavior:

Some unnecessary type casts have been removed.

[arvidn]

@altendky you're right that these type annotations aren't necessary. I didn't intentionally add them, I just restored this code to the state before I made any changes. I'll remove them though

[arvidn]

I think the missing coverage is reasonable. This is undoing recent changes (that also landed without test coverage)

[github-actions]

File	Coverage	Missing Lines
chia/full_node/full_node_api.py	0.0%	lines 954, 956
chia/timelord/timelord.py	66.7%	lines 282
chia/timelord/timelord_state.py	50.0%	lines 90, 93-94
chia/wallet/wallet_blockchain.py	66.7%	lines 167

Total	Missing	Coverage
61 lines	7 lines	88%