[hid_core] Code cleanup (#4461)

- [x] I have read and followed the [Contribution Guidelines](https://git.eden-emu.dev/eden-emu/eden/src/branch/master/CONTRIBUTING.md#code-contributions).
- [x] I have read and followed the [AI Policy](https://git.eden-emu.dev/eden-emu/eden/src/branch/master/docs/policies/AI.md)
- [x] I have read and followed the [Coding Guidelines](https://git.eden-emu.dev/eden-emu/eden/src/branch/master/docs/policies/Coding.md) to the best of my ability.

-------------------
This is just a code cleanup. This is no longer necessary due to commit #4457.

Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/4461
Reviewed-by: lizzie <lizzie@eden-emu.dev>

src/hid_core/frontend/emulated_controller.h

@@ -22,7 +22,6 @@
 #include "common/settings.h"
 #include "common/vector_math.h"
 #include "hid_core/frontend/motion_input.h"
-#include "hid_core/hid_core.h"
 #include "hid_core/hid_types.h"
 #include "hid_core/irsensor/irs_types.h"
 
@@ -585,7 +584,6 @@ private:
     std::array<VibrationValue, 2> last_vibration_value{DEFAULT_VIBRATION_VALUE,
                                                        DEFAULT_VIBRATION_VALUE};
     std::array<std::chrono::steady_clock::time_point, 2> last_vibration_timepoint{};
-    std::array<bool, HIDCore::available_controllers> controller_connected{};
 
     // Atomically synched values
     std::atomic<HID::NpadStyleIndex> npad_type{HID::NpadStyleIndex::None};