Fix constructor argument.

It inferred wrong template deduction for index type
For instance
``
SparseMatrixDescriptor S(5);
``
implied `SparseMatrixDescriptor::IndexType` to be `int`

src/algebra/SparseMatrixDescriptor.hpp

@@ -137,7 +137,7 @@ class SparseMatrixDescriptor
     return values;
   }
 
-  SparseMatrixDescriptor(IndexType nb_row) : m_row_array{nb_row} {}
+  SparseMatrixDescriptor(size_t nb_row) : m_row_array{nb_row} {}
 
   ~SparseMatrixDescriptor() = default;
 };