Fix bug: diveToFile breaks M23 (#13865)

Marlin/src/feature/power_loss_recovery.cpp

@@ -392,7 +392,6 @@ void PrintJobRecovery::resume() {
 
   // Resume the SD file from the last position
   char *fn = info.sd_filename;
-  while (*fn == '/') fn++;
   sprintf_P(cmd, PSTR("M23 %s"), fn);
   gcode.process_subcommands_now(cmd);
   sprintf_P(cmd, PSTR("M24 S%ld T%ld"), info.sdpos, info.print_job_elapsed);