Disable OpenNcThemeData detour on ARM64

This detour was causing an illegal instruction (0xc000001d) crash on
ARM64. Note that because the detour is now disabled on ARM64, some
scrollbars (e.g. the listview scrollbar) will appear light when dark
mode is enabled on ARM64.

This fixes #478.

Explorer++/Explorer++/DarkModeHelper.cpp

@@ -112,6 +112,11 @@ void DarkModeHelper::EnableForApp(bool enable)
 	FlushMenuThemes();
 	RefreshImmersiveColorPolicyState();
 
+	// This detour seemingly causes an illegal instruction (0xc000001d) crash on ARM64 (see #478),
+	// which is the reason for the check here. Note that while disabling this detour on ARM64
+	// prevents the crash, it also means some scrollbars (e.g. the listview scrollbar) will appear
+	// light when dark mode is enabled on ARM64.
+#if !defined(BUILD_ARM64)
 	LONG res;
 
 	if (enable)
@@ -124,6 +129,7 @@ void DarkModeHelper::EnableForApp(bool enable)
 	}
 
 	DCHECK_EQ(res, NO_ERROR);
+#endif
 
 	m_darkModeEnabled = enable;