Fix wrong sign for 200 TB score

Fix another case of 9032c6cbe7

*    TB values can have a distance of 0, mainly when we are in a tb position but haven't found mate.
*    Add a missing whitespace to UCIEngine::on_update_no_moves()

Closes https://github.com/official-stockfish/Stockfish/pull/5172

No functional change

src/score.cpp

@@ -36,7 +36,7 @@ Score::Score(Value v, const Position& pos) {
     else if (std::abs(v) <= VALUE_TB)
     {
         auto distance = VALUE_TB - std::abs(v);
-        score         = (v > 0) ? TBWin{distance} : TBWin{-distance};
+        score         = (v > 0) ? Tablebase{distance, true} : Tablebase{-distance, false};
     }
     else
     {