Fix pio environments for Anet 1.x (#17109)

Marlin/src/pins/pins.h

 #elif MB(OMCA)
   #include "sanguino/pins_OMCA.h"               // ATmega644P, ATmega644                  env:sanguino644p
 #elif MB(ANET_10)
-  #include "sanguino/pins_ANET_10.h"            // ATmega1284P                            env:sanguino1284p
+  #include "sanguino/pins_ANET_10.h"            // ATmega1284P                            env:melzi env:melzi_optiboot
 #elif MB(SETHI)
   #include "sanguino/pins_SETHI.h"              // ATmega644P, ATmega644, ATmega1284P     env:sanguino644p env:sanguino1284p