Fix one flaky [SparkSQL?] fingerprinting test (#37853)

* Fix flake in fingerprint test:

```
FAIL in metabase.sync.analyze.fingerprint-test/fingerprint-test (fingerprint_test.clj:287)

:sparksql
 Fingerprints should actually get saved with the correct values Text fingerprints
expected: {:global {:distinct-count 100, :nil% 0.0},
           :type {:type/Text {:average-length #<Fn@2ee5402f metabase.sync.analyze.fingerprint_test/fn__139755[fn/fn]>,
                              :percent-email 0.0,
                              :percent-json 0.0,
                              :percent-state 0.0,
                              :percent-url 0.0}}}
  actual: nil
```

* Typo fix