hid/controller/npad: Remove unnecessary const from void return type

This literally does nothing.

src/core/hle/service/hid/controllers/npad.cpp

@@ -316,7 +316,7 @@ void Controller_NPad::SetSupportedNPadIdTypes(u8* data, std::size_t length) {
     std::memcpy(supported_npad_id_types.data(), data, length);
 }
 
-const void Controller_NPad::GetSupportedNpadIdTypes(u32* data, std::size_t max_length) {
+void Controller_NPad::GetSupportedNpadIdTypes(u32* data, std::size_t max_length) {
     ASSERT(max_length < supported_npad_id_types.size());
     std::memcpy(data, supported_npad_id_types.data(), supported_npad_id_types.size());
 }

src/core/hle/service/hid/controllers/npad.h

@@ -92,7 +92,7 @@ public:
     NPadType GetSupportedStyleSet() const;
 
     void SetSupportedNPadIdTypes(u8* data, std::size_t length);
-    const void GetSupportedNpadIdTypes(u32* data, std::size_t max_length);
+    void GetSupportedNpadIdTypes(u32* data, std::size_t max_length);
     std::size_t GetSupportedNPadIdTypesSize() const;
 
     void SetHoldType(NpadHoldType joy_hold_type);