fix jiwer error

app.py

@@ -24,8 +24,8 @@ def calculate_sentence_wer(reference, hypothesis):
     """
     Calculate WER for each sentence and overall statistics.
     """
-    reference_sentences = jiwer.split_into_sentences(reference)
-    hypothesis_sentences = jiwer.split_into_sentences(hypothesis)
+    reference_sentences = reference.split()
+    hypothesis_sentences = hypothesis.split()
 
     if len(reference_sentences) != len(hypothesis_sentences):
         raise ValueError("Reference and hypothesis must contain the same number of sentences")