Simplify number_float hash case: reuse existing type tag

The number_float case introduced a redundant numeric_type local that
duplicated the already-computed type variable (both equal
value_t::number_float within that case). Removed per review feedback.

Signed-off-by: Niels Lohmann <mail@nlohmann.me>

include/nlohmann/detail/hash.hpp

diff --git a/include/nlohmann/detail/hash.hpp b/include/nlohmann/detail/hash.hpp
index 9df26dc..5e3f9ef 100644
--- a/include/nlohmann/detail/hash.hpp
+++ b/include/nlohmann/detail/hash.hpp
@@ -188,8 +188,7 @@
         case BasicJsonType::value_t::number_float:
         {
             const auto h = std::hash<number_float_t> {}(j.template get<number_float_t>());
-            const auto numeric_type = static_cast<std::size_t>(BasicJsonType::value_t::number_float);
-            return combine(numeric_type, h);
+            return combine(type, h);
         }
 
         case BasicJsonType::value_t::binary:

single_include/nlohmann/json.hpp

diff --git a/single_include/nlohmann/json.hpp b/single_include/nlohmann/json.hpp
index 4b233ed..438973e 100644
--- a/single_include/nlohmann/json.hpp
+++ b/single_include/nlohmann/json.hpp
@@ -6856,8 +6856,7 @@
         case BasicJsonType::value_t::number_float:
         {
             const auto h = std::hash<number_float_t> {}(j.template get<number_float_t>());
-            const auto numeric_type = static_cast<std::size_t>(BasicJsonType::value_t::number_float);
-            return combine(numeric_type, h);
+            return combine(type, h);
         }
 
         case BasicJsonType::value_t::binary: