wizard: Ask about the sheet before doing Z calibration

Ask to install the sheet immediately after removing the test print.
This makes further messages less confusing.

Firmware/ultralcd.cpp

@@ -4029,11 +4029,11 @@ void lcd_wizard(WizState state)
 		case S::Z:
 			lcd_show_fullscreen_message_and_wait_P(_i("Please remove shipping helpers first."));////MSG_REMOVE_SHIPPING_HELPERS c=20 r=3
 			lcd_show_fullscreen_message_and_wait_P(_i("Now remove the test print from steel sheet."));////MSG_REMOVE_TEST_PRINT c=20 r=4
-			lcd_show_fullscreen_message_and_wait_P(_i("I will run z calibration now."));////MSG_WIZARD_Z_CAL c=20 r=8
 			wizard_event = lcd_show_fullscreen_message_yes_no_and_wait_P(_T(MSG_STEEL_SHEET_CHECK), false);
 			if (wizard_event == LCD_MIDDLE_BUTTON_CHOICE) {
 				lcd_show_fullscreen_message_and_wait_P(_T(MSG_PLACE_STEEL_SHEET));
 			}
+			lcd_show_fullscreen_message_and_wait_P(_i("I will run z calibration now."));////MSG_WIZARD_Z_CAL c=20 r=8
 			wizard_event = gcode_M45(true, 0);
 			if (!wizard_event) {
 				state = S::Failed;