Merge pull request randombit#4235 from randombit/jack/pcurves-w-3

In pcurves reduce window size for 2-ary multiplication

src/lib/math/pcurves/pcurves_impl/pcurves_wrap.h

@@ -27,7 +27,7 @@ class PrimeOrderCurveImpl final : public PrimeOrderCurve {
    public:
       class PrecomputedMul2TableC final : public PrimeOrderCurve::PrecomputedMul2Table {
          public:
-            static constexpr size_t WindowBits = 4;
+            static constexpr size_t WindowBits = 3;
 
             const WindowedMul2Table<C, WindowBits>& table() const { return m_table; }