fix number input when staying in same state

include/config.h

 
 // in seconds
 #define MAX_TANK_FILL_TIME (70)
-#define AUTO_PUMP_RUNTIME 3
+#define AUTO_PUMP_RUNTIME 4
 #define AUTO_STIRR_RUNTIME 60
 #define MAX_AUTO_PLANT_RUNTIME (35 * 60)
 #define MAX_PUMP_RUNTIME 30

src/Statemachine.cpp

                     switch_to(error);
                 } else {
                     selected_plants.set(selected_id - 1);
+                    menu_entered_digits = "";
                     switch_to(auto_plant);
                 }
             }
                     switch_to(error);
                 } else {
                     selected_plants.set(selected_id - 1);
+                    menu_entered_digits = "";
                     switch_to(fillnwater_plant);
                 }
             }