Fix ANYCUBIC_LCD_I3MEGA compile (#21585)

Marlin/src/lcd/extui/lib/anycubic_i3mega/anycubic_i3mega_lcd.cpp

           } break;
 
           case 4: { // A4 GET FAN SPEED
-            const float fanPercent = getActualFan_percent(FAN0);
-            SEND_PGM_VAL("A4V ", int(LIMIT(fanPercent, 0, 100)));
+            SEND_PGM_VAL("A4V ", int(getActualFan_percent(FAN0)));
           } break;
 
           case 5: { // A5 GET CURRENT COORDINATE