Fixed a string in the options menu

The "Proc Sorting" option in the proc section of the options menu has "cpu direct" as the 7th option but the description of the option mentioned it using its older name, "cpu responsive". Changed this to "cpu direct" in the description.

src/btop_menu.cpp

@@ -550,10 +550,10 @@ namespace Menu {
 				"Possible values:",
 				"\"pid\", \"program\", \"arguments\", \"threads\",",
 				"\"user\", \"memory\", \"cpu lazy\" and",
-				"\"cpu responsive\".",
+				"\"cpu direct\".",
 				"",
 				"\"cpu lazy\" updates top process over time.",
-				"\"cpu responsive\" updates top process",
+				"\"cpu direct\" updates top process",
 				"directly."},
 			{"proc_reversed",
 				"Reverse processes sorting order.",