Fix keyword spotting. (#1689)

Reset the stream right after detecting a keyword

sherpa-onnx/java-api/src/com/k2fsa/sherpa/onnx/KeywordSpotter.java

@@ -27,6 +27,10 @@ public class KeywordSpotter {
         decode(ptr, s.getPtr());
     }
 
+    public void reset(OnlineStream s) {
+        reset(ptr, s.getPtr());
+    }
+
     public boolean isReady(OnlineStream s) {
         return isReady(ptr, s.getPtr());
     }
@@ -60,6 +64,8 @@ public class KeywordSpotter {
 
     private native void decode(long ptr, long streamPtr);
 
+    private native void reset(long ptr, long streamPtr);
+
     private native boolean isReady(long ptr, long streamPtr);
 
     private native Object[] getResult(long ptr, long streamPtr);