Sneak: Improve and fix various things

Remove useless `got_teleported`.
Fix jitter when walking against the sneak limits.
Fix damage evading on sneak ladders.

src/script/lua_api/l_localplayer.h

@@ -39,7 +39,6 @@ class LuaLocalPlayer : public ModApiBase
 
 	static int l_get_name(lua_State *L);
 
-	static int l_is_teleported(lua_State *L);
 	static int l_is_attached(lua_State *L);
 	static int l_is_touching_ground(lua_State *L);
 	static int l_is_in_liquid(lua_State *L);