Extend thermistor 1047 to 500°C

Marlin/src/module/thermistor/thermistor_1047.h

   PtLine(150, 1000, 4700),
   PtLine(200, 1000, 4700),
   PtLine(250, 1000, 4700),
-  PtLine(300, 1000, 4700)
+  PtLine(300, 1000, 4700),
+  PtLine(350, 1000, 4700),
+  PtLine(400, 1000, 4700),
+  PtLine(450, 1000, 4700),
+  PtLine(500, 1000, 4700)
 };