Encoder direction: Wrangle, Revert select screen change (#14628)

Marlin/src/lcd/ultralcd.h

@@ -424,6 +424,11 @@ public:
     static int16_t preheat_hotend_temp[2], preheat_bed_temp[2];
     static uint8_t preheat_fan_speed[2];
 
+    // Select Screen (modal NO/YES style dialog)
+    static bool selection;
+    static void set_selection(const bool sel) { selection = sel; }
+    static bool update_selection();
+
     static void manage_manual_move();
 
     static bool lcd_clicked;