fix block.compose_state

src/logic/scripting/lua/libblock.cpp

@@ -385,7 +385,7 @@ static int l_raycast(lua::State* L) {
 }
 
 static int l_compose_state(lua::State* L) {
-    if (lua::istable(L, 1) || lua::objlen(L, 1) < 3) {
+    if (!lua::istable(L, 1) || lua::objlen(L, 1) < 3) {
         throw std::runtime_error("expected array of 3 integers");
     }
     blockstate state {};