Fix a bug where bigram search would never return

Bug: 4690487
Change-Id: Ie8f3f651508cc48bbb043a0b308f7e0d1524371c
diff --git a/native/src/bigram_dictionary.cpp b/native/src/bigram_dictionary.cpp
index 4bc4365..11e6dc2 100644
--- a/native/src/bigram_dictionary.cpp
+++ b/native/src/bigram_dictionary.cpp
@@ -111,7 +111,7 @@
     mMaxBigrams = maxBigrams;
 
     if (HAS_BIGRAM && IS_LATEST_DICT_VERSION) {
-        int pos = mParentDictionary->isValidWord(prevWord, prevWordLength);
+        int pos = mParentDictionary->getBigramPosition(prevWord, prevWordLength);
         if (DEBUG_DICT) {
             LOGI("Pos -> %d", pos);
         }