Corrected SlicedPacket::from_ether_type so it sets the link field

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 99.36%. Comparing base (7a9b992) to head (950c5c9).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #102 +/- ## ======================================= Coverage 99.35% 99.36% ======================================= Files 163 163 Lines 29701 29725 +24 ======================================= + Hits 29509 29535 +26 + Misses 192 190 -2 ```

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