Fixes #4576: Convert filamentUsed to long for display

Marlin/ultralcd.cpp

         STATIC_ITEM(MSG_INFO_PRINT_LONGEST ": ", false, false);                                        // Longest job time:
         STATIC_ITEM("", false, false, buffer);                                                         // 99y 364d 23h 59m 59s
 
-        sprintf_P(buffer, PSTR("%im"), stats.filamentUsed / 1000);
+        sprintf_P(buffer, PSTR("%ldm"), long(stats.filamentUsed / 1000));
         STATIC_ITEM(MSG_INFO_PRINT_FILAMENT ": ", false, false);                                       // Extruded total:
         STATIC_ITEM("", false, false, buffer);                                                         // 125m
         END_SCREEN();