lualoader: fix the autoboot_delay countdown message

When the timer drops from double to single digits, a spare 'e' is left
on the end of the line as we don't overwrite it. Include an extra space
at the end to account for this and overwrite the leftover character.

PR:		259429
MFC after:	3 days
Reviewed by:	emaste

stand/lua/menu.lua

@@ -522,7 +522,7 @@ function menu.autoboot(delay)
 			last = time
 			screen.setcursor(x, y)
 			print("Autoboot in " .. time ..
-			    " seconds. [Space] to pause")
+			    " seconds. [Space] to pause ")
 			screen.defcursor()
 		end
 		if io.ischar() then