[Paramerter] Update get method.

include/aidge/utils/Parameter.hpp

@@ -139,7 +139,7 @@ public:
         assert(false && "parameter not found");
     }
 
-    template <typename R, std::size_t SIZE = std::tuple_size<std::tuple<T...>>::value-1>
+    template <typename R, std::size_t SIZE = std::tuple_size<std::tuple<T...>>::value>
     constexpr typename std::enable_if<(SIZE > 0), R&>::type get(std::size_t i) {
         if (i == SIZE-1) {
             if (std::is_same<R, typename std::tuple_element<SIZE-1,std::tuple<T...>>::type>::value) {
@@ -154,7 +154,7 @@ public:
         }
     }
 
-    template <typename R, std::size_t SIZE = std::tuple_size<std::tuple<T...>>::value-1>
+    template <typename R, std::size_t SIZE = std::tuple_size<std::tuple<T...>>::value>
     [[noreturn]] constexpr typename std::enable_if<(SIZE == 0), R&>::type get(std::size_t /*i*/) {
         assert(false && "parameter not found");
     }