fix: include header with project identifier for cpp (#246)

Author: hyochan

packages/create-react-native-library/templates/cpp-library/android/cpp-adapter.cpp

@@ -1,5 +1,5 @@
 #include <jni.h>
-#include "example.h"
+#include "<%- project.identifier %>.h"
 
 extern "C"
 JNIEXPORT jint JNICALL