fix issue with syncing testnet, introduced in: Get block spends (#16451)

[arvidn]

Purpose:

When soft fork 2 activated on mainnet, most of the pre-softfork special cases were removed from the code. However, testnet still violated some of the new soft-fork rules prior to activation, so some soft fork 2 special cases need to remain in order to support testnet.

Specifically, the NO_RELATIVE_CONDITIONS_ON_EPHEMERAL need to be disabled on lower block heights. On mainnet, this is always active now.

There was a bug in #16451 which enabled NO_RELATIVE_CONDITIONS_ON_EPHEMERAL unconditionally, which is fine on mainnet, but not on testnet. This restores the previous behavior.

Current Behavior:

testnet10 can not sync from scratch

New Behavior:

testnet10 can sync from scratch (although, I have not tested this)

Testing Notes:

I'm hoping @cmmarslender can test the sync-from-scratch on testnet10.

[arvidn]

The sync test appears to have succeeded

[coveralls-official]

Pull Request Test Coverage Report for Build 6508907290

• 2 of 2 (100.0%) changed or added relevant lines in 1 file are covered.
• 18 unchanged lines in 6 files lost coverage.
• Overall coverage decreased (-0.01%) to 89.715%

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Files with Coverage Reduction	New Missed Lines	%
chia/full_node/full_node_api.py	1	78.23%
chia/server/node_discovery.py	1	78.57%
chia/full_node/full_node.py	2	86.01%
chia/timelord/timelord_launcher.py	3	61.17%
chia/wallet/wallet_node.py	5	87.49%
chia/daemon/server.py	6	86.79%

Totals
Change from base Build 6485614031:	-0.01%
Covered Lines:	87060
Relevant Lines:	97024

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💛 - Coveralls

[wjblanke]

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