Set LMRPVMoves to 10 instead of 14

After 934 games at 1+0

Mod vs Orig +228 =493 -213 50.80%  474.5/934   +6 ELO

So it seems not negative and there is also the added
benefit to unify LMRPVMoves use in search_pv() and in
root list.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>

src/search.cpp

@@ -916,7 +916,7 @@ namespace {
         else
         {
             if (   newDepth >= 3*OnePly
-                && i >= MultiPV + LMRPVMoves - 2 // Remove -2 and decrease LMRPVMoves instead ?
+                && i >= MultiPV + LMRPVMoves
                 && !dangerous
                 && !moveIsCapture
                 && !move_is_promotion(move)