Fix MSVC error

Compiling the current master with MSVC gives the following error:

```
search.cpp(956): error C2660: 'operator *': function does not take 1 arguments
types.h(303): note: see declaration of 'operator *'
```

This was introduced in commit:
88de112b84

We use a suggestion by @vondele to fix the error, thanks!

No functional change.

src/search.cpp

@@ -951,7 +951,7 @@ moves_loop: // When in check, search starts from here
                   continue;
           }
           else if (   !extension // (~20 Elo)
-                   && !pos.see_ge(move, -Value(PawnValueEg * (depth / ONE_PLY))))
+                   && !pos.see_ge(move, -PawnValueEg * (depth / ONE_PLY)))
                   continue;
       }