Avoid out-of-bounds array access when checking custom color for TV Remote (#4356)

src/input/controller.h

@@ -201,6 +201,9 @@ public:
         controller_override_colors[i] = {r, g, b};
     }
     static std::optional<Colour> GetControllerCustomColor(s32 i) {
+        if (i >= controller_override_colors.size()) {
+            return {};
+        }
         return controller_override_colors[i];
     }
 };