IMUAccelerometer: consistency of BoundCount checks

Similar to the guitar, only control[0] was checked, and that felt random.

Source/Core/InputCommon/ControllerEmu/ControlGroup/IMUAccelerometer.cpp

@@ -4,13 +4,12 @@
 
 #include "InputCommon/ControllerEmu/ControlGroup/IMUAccelerometer.h"
 
+#include <algorithm>
 #include <memory>
 
 #include "Common/Common.h"
 #include "Core/HW/WiimoteEmu/WiimoteEmu.h"
-#include "InputCommon/ControlReference/ControlReference.h"
 #include "InputCommon/ControllerEmu/Control/Control.h"
-#include "InputCommon/ControllerEmu/Control/Input.h"
 
 namespace ControllerEmu
 {
@@ -25,9 +24,15 @@ IMUAccelerometer::IMUAccelerometer(std::string name_, std::string ui_name_)
   AddInput(Translate, _trans("Backward"));
 }
 
+bool IMUAccelerometer::AreInputsBound() const
+{
+  return std::all_of(controls.begin(), controls.end(),
+                     [](const auto& control) { return control->control_ref->BoundCount() > 0; });
+}
+
 std::optional<IMUAccelerometer::StateData> IMUAccelerometer::GetState() const
 {
-  if (controls[0]->control_ref->BoundCount() == 0)
+  if (!AreInputsBound())
     return std::nullopt;
 
   StateData state;

Source/Core/InputCommon/ControllerEmu/ControlGroup/IMUAccelerometer.h

@@ -20,5 +20,7 @@ public:
   IMUAccelerometer(std::string name, std::string ui_name);
 
   std::optional<StateData> GetState() const;
+
+  bool AreInputsBound() const;
 };
 }  // namespace ControllerEmu