fix: distance measure in non llm CR

[shahules786]

from ragas import evaluate
from ragas.metrics import NonLLMContextRecall, NonLLMContextPrecisionWithReference
from ragas import SingleTurnSample, EvaluationDataset
from ragas.metrics._string import DistanceMeasure

sample = SingleTurnSample(
    retrieved_contexts=["Paris is the capital of France."], 
    reference_contexts=["Paris is the capital of France.", "The Eiffel Tower is one of the most famous landmarks in Paris."]
)
dataset = EvaluationDataset(samples=[sample, sample, sample])

scorer = NonLLMContextRecall()

result = evaluate(
    dataset,
    metrics=[scorer],
)

scorer.distance_measure = DistanceMeasure.JARO_WINKLER

result = evaluate(
    dataset,
    metrics=[scorer],
)```