fuzz: Clarify Apple-Clang-16 workaround

src/test/fuzz/fuzz.cpp

@@ -72,8 +72,8 @@ auto& FuzzTargets()
 
 void FuzzFrameworkRegisterTarget(std::string_view name, TypeTestOneInput target, FuzzTargetOptions opts)
 {
-    const auto it_ins{FuzzTargets().try_emplace(name, FuzzTarget /* temporary can be dropped after clang-16 */ {std::move(target), std::move(opts)})};
+    const auto [it, ins]{FuzzTargets().try_emplace(name, FuzzTarget /* temporary can be dropped after Apple-Clang-16 ? */ {std::move(target), std::move(opts)})};
-    Assert(it_ins.second);
+    Assert(ins);
 }
 
 static std::string_view g_fuzz_target;