Fix keyword spotting. (#1689)

Reset the stream right after detecting a keyword

swift-api-examples/SherpaOnnx.swift

@@ -1076,6 +1076,10 @@ class SherpaOnnxKeywordSpotterWrapper {
     SherpaOnnxDecodeKeywordStream(spotter, stream)
   }
 
+  func reset() {
+    SherpaOnnxResetKeywordStream(spotter, stream)
+  }
+
   func getResult() -> SherpaOnnxKeywordResultWrapper {
     let result: UnsafePointer<SherpaOnnxKeywordResult>? = SherpaOnnxGetKeywordResult(
       spotter, stream)

swift-api-examples/keyword-spotting-from-file.swift

@@ -70,6 +70,9 @@ func run() {
     spotter.decode()
     let keyword = spotter.getResult().keyword
     if keyword != "" {
+      // Remember to call reset() right after detecting a keyword
+      spotter.reset()
+
       print("Detected: \(keyword)")
     }
   }