Make script invalid flag an assertion

[newhoggy]

This means if --script-invalid is specified, the build transaction will fail if the scripts are valid.

[newhoggy]

$ scripts/plutus/always-fails.sh
Socket path: example/node-bft1/node.sock
Socket path: /Users/jky/wrk/iohk/cardano-node
srwxr-xr-x  1 jky  staff  0 18 Aug 15:25 example/node-bft1/node.sock
Always succeeds Plutus script in use. Any datum and redeemer combination will succeed.
Script at: ./scripts/plutus/scripts/always-succeeds-spending.plutus
{
    "16b0125dc3fb55644bc189aedea012efa4a48382480d879c4593eb3833deeff0#0": {
        "address": "addr_test1vz680r6cw6g5kd492arhgc3mug3z25jyx2cglsjhx36n4dsa7yh3t",
        "value": {
            "lovelace": 1000000000000
        }
    }
}Transaction successfully submitted.
Pausing for 5 seconds...
{
    "e0ae1388a7866ebadfbdd14409fde0c6bdb4a4e25a2755fc9eab89ef232bfacd#0": {
        "address": "addr_test1vz680r6cw6g5kd492arhgc3mug3z25jyx2cglsjhx36n4dsa7yh3t",
        "value": {
            "lovelace": 666666666394
        }
    }
}Plutus txin
e0ae1388a7866ebadfbdd14409fde0c6bdb4a4e25a2755fc9eab89ef232bfacd#1
Collateral
e0ae1388a7866ebadfbdd14409fde0c6bdb4a4e25a2755fc9eab89ef232bfacd#0
Command failed: transaction build  Error: One or more of the scripts were expected to fail validation, but none did.

[Jimbo4350]

Nice, one minor change.

[newhoggy]

bors merge

[iohk-bors]

Build succeeded:

• buildkite/cardano-node
• ci/hydra-eval
• ci/hydra-build:required