Revert "Fixed small typo that would prevent compiling"

This reverts commit 51ae4881ab.

Marlin/Marlin_main.cpp

   }
 }
 #define HOMEAXIS(LETTER) homeaxis(LETTER##_AXIS)
-void refresh_cmd_timeout(void)
++void refresh_cmd_timeout(void)
 {
   previous_millis_cmd = millis();
 }