refactor: Remove unused error()

Author: MarcoFalke

src/logging.h

@@ -263,10 +263,4 @@ static inline void LogPrintf_(const std::string& logging_function, const std::st
 // Deprecated conditional logging
 #define LogPrint(category, ...)  LogDebug(category, __VA_ARGS__)
 
-template <typename... Args>
-void error(const char* fmt, const Args&... args)
-{
-    LogPrintf("ERROR: %s\n", tfm::format(fmt, args...));
-}
-
 #endif // BITCOIN_LOGGING_H