[libc++] Fixes charconv operator bool tests. (#80598)

This was spotted by @philnik.

NOKEYCHECK=True
GitOrigin-RevId: 7291761669dd63624ccaab30887aca7e9c7d3273

Author: mordante

test/std/utilities/charconv/charconv.syn/from_chars_result.operator_bool.pass.cpp

@@ -28,13 +28,13 @@ constexpr bool test() {
   {
     std::from_chars_result value{nullptr, std::errc{}};
     assert(bool(value) == true);
-    static_assert(noexcept(bool(true)) == true);
+    static_assert(noexcept(bool(value)) == true);
   }
   // False
   {
     std::from_chars_result value{nullptr, std::errc::value_too_large};
     assert(bool(value) == false);
-    static_assert(noexcept(bool(true)) == true);
+    static_assert(noexcept(bool(value)) == true);
   }
 
   return true;

test/std/utilities/charconv/charconv.syn/to_chars_result.operator_bool.pass.cpp

@@ -28,13 +28,13 @@ constexpr bool test() {
   {
     std::to_chars_result value{nullptr, std::errc{}};
     assert(bool(value) == true);
-    static_assert(noexcept(bool(true)) == true);
+    static_assert(noexcept(bool(value)) == true);
   }
   // False
   {
     std::to_chars_result value{nullptr, std::errc::value_too_large};
     assert(bool(value) == false);
-    static_assert(noexcept(bool(true)) == true);
+    static_assert(noexcept(bool(value)) == true);
   }
 
   return true;