Replace static_cast with level_to_number in color sinks

include/spdlog/sinks/ansicolor_sink-inl.h

@@ -52,7 +52,7 @@ SPDLOG_INLINE void ansicolor_sink<ConsoleMutex>::log(const details::log_msg &msg
         // before color range
         print_range_(formatted, 0, msg.color_range_start);
         // in color range
-        print_ccode_(colors_.at(static_cast<size_t>(msg.log_level)));
+        print_ccode_(colors_.at(level_to_number(msg.log_level)));
         print_range_(formatted, msg.color_range_start, msg.color_range_end);
         print_ccode_(reset);
         // after color range

include/spdlog/sinks/wincolor_sink-inl.h

@@ -45,7 +45,7 @@ template<typename ConsoleMutex>
 void SPDLOG_INLINE wincolor_sink<ConsoleMutex>::set_color(level level, std::uint16_t color)
 {
     std::lock_guard<mutex_t> lock(mutex_);
-    colors_[static_cast<size_t>(level)] = color;
+    colors_[level_to_number(level)] = color;
 }
 
 template<typename ConsoleMutex>