Fix parsing for SeaFET or DualGTP extra sensors

[ghost]

In the example *.raw files that I have for the SBE 19plusV2 from the trawl survey, neither of these flags are set and so I have it hardcoded in to just skip them should they appear in a subsequent *.raw file. Instead, I should probably handle when they are missing or when they appear and are either flagged as yes or no. See parseHex.ts: 190-191.