Fixed missing "No matching overload, candidates:\n" part of the "func…

…tion overload not found" error.

src/function.cpp

@@ -116,7 +116,7 @@ void invoke_context::format_error(
             f->format_signature(L, function_name);
             ++count;
         }
-        lua_concat(L, count * 2);
+        lua_concat(L, count * 2 + 1);
     }
     else
     {