set: Implement GetQuestFlag

Simply returns a true/false value indicating if the system is a kiosk system. This has been mapped to a config option for the purposes of yuzu.

src/core/hle/service/set/set.cpp

@@ -95,6 +95,14 @@ void SET::GetAvailableLanguageCodeCount2(Kernel::HLERequestContext& ctx) {
     PushResponseLanguageCode(ctx, post4_0_0_max_entries);
 }
 
+void SET::GetQuestFlag(Kernel::HLERequestContext& ctx) {
+    LOG_DEBUG(Service_SET, "called");
+
+    IPC::ResponseBuilder rb{ctx, 3};
+    rb.Push(RESULT_SUCCESS);
+    rb.Push(static_cast<u32>(Settings::values.quest_flag));
+}
+
 void SET::GetLanguageCode(Kernel::HLERequestContext& ctx) {
     LOG_DEBUG(Service_SET, "called {}", Settings::values.language_index);
 
@@ -114,7 +122,7 @@ SET::SET() : ServiceFramework("set") {
         {5, &SET::GetAvailableLanguageCodes2, "GetAvailableLanguageCodes2"},
         {6, &SET::GetAvailableLanguageCodeCount2, "GetAvailableLanguageCodeCount2"},
         {7, nullptr, "GetKeyCodeMap"},
-        {8, nullptr, "GetQuestFlag"},
+        {8, &SET::GetQuestFlag, "GetQuestFlag"},
         {9, nullptr, "GetKeyCodeMap2"},
     };
     // clang-format on

src/core/hle/service/set/set.h

@@ -42,6 +42,7 @@ private:
     void GetAvailableLanguageCodes2(Kernel::HLERequestContext& ctx);
     void GetAvailableLanguageCodeCount(Kernel::HLERequestContext& ctx);
     void GetAvailableLanguageCodeCount2(Kernel::HLERequestContext& ctx);
+    void GetQuestFlag(Kernel::HLERequestContext& ctx);
 };
 
 } // namespace Service::Set