osdep/terminal-unix: use numpad keycodes

Use the dedicated numpad keycodes for +-*/.

Author: na-na-hi

osdep/terminal-unix.c

@@ -130,11 +130,11 @@ static const struct key_entry keys[] = {
     {"\033Ob", MP_KEY_DOWN | MP_KEY_MODIFIER_CTRL},
     {"\033Oc", MP_KEY_RIGHT | MP_KEY_MODIFIER_CTRL},
     {"\033Od", MP_KEY_LEFT | MP_KEY_MODIFIER_CTRL},
-    {"\033Oj", '*'}, // also keypad, but we don't have separate codes for them
-    {"\033Ok", '+'},
-    {"\033Om", '-'},
+    {"\033Oj", MP_KEY_KPMULTIPLY},
+    {"\033Ok", MP_KEY_KPADD},
+    {"\033Om", MP_KEY_KPSUBTRACT},
     {"\033On", MP_KEY_KPDEC},
-    {"\033Oo", '/'},
+    {"\033Oo", MP_KEY_KPDIVIDE},
     {"\033Op", MP_KEY_KP0},
     {"\033Oq", MP_KEY_KP1},
     {"\033Or", MP_KEY_KP2},