Remove commented out and unused functions prototypes.

Firmware/ultralcd.cpp

@@ -122,17 +122,13 @@ static void prusa_stat_diameter();
 static void prusa_stat_temperatures();
 static void prusa_stat_printinfo();
 static void lcd_farm_no();
-//static void lcd_menu_extruder_info();           // NOT static due to using inside "Marlin_main" module ("manage_inactivity()")
 static void lcd_menu_xyz_y_min();
 static void lcd_menu_xyz_skew();
 static void lcd_menu_xyz_offset();
 static void lcd_menu_fails_stats_mmu();
 static void lcd_menu_fails_stats_mmu_print();
 static void lcd_menu_fails_stats_mmu_total();
-//static void lcd_menu_show_sensors_state();      // NOT static due to using inside "Marlin_main" module ("manage_inactivity()")
-
 static void mmu_unload_filament();
-
 static void mmu_fil_eject_menu();
 static void mmu_load_to_nozzle_menu();
 #ifdef MMU_HAS_CUTTER