remove warning

src/PinkIndexer.cpp

@@ -101,7 +101,7 @@ void PinkIndexer::refine(Lattice& indexedLattice, const Matrix3Xf& ucsDirections
             break;
         case RefinementType::firstFixedThenVariableLatticeParametersMultiSeedLengths:
         {
-            constexpr unsigned refinemenTries = 750;
+            constexpr int refinemenTries = 750;
             int fittedNodesCount[refinemenTries];
             double fittedNodesMeanDefects[refinemenTries];
             Lattice fittedLattices[refinemenTries];
@@ -142,7 +142,7 @@ void PinkIndexer::refine(Lattice& indexedLattice, const Matrix3Xf& ucsDirections
         break;
         case RefinementType::firstFixedThenVariableLatticeParametersMultiSeed:
         {
-            constexpr unsigned refinementTries = 750;
+            constexpr int refinementTries = 750;
             int fittedNodesCount[refinementTries];
             double fittedNodesMeanDefects[refinementTries];
             Lattice fittedLattices[refinementTries];