input_common/helpers: Mark analog property structs members as static constexpr

These are const with no dependency on any other data members, so we can
make these static constexpr to reduce the overall object size.

src/input_common/helpers/touch_from_buttons.cpp

@@ -59,11 +59,19 @@ public:
     }
 
 private:
+    static constexpr Common::Input::AnalogProperties properties{
+        .deadzone = 0.0f,
+        .range = 1.0f,
+        .threshold = 0.5f,
+        .offset = 0.0f,
+        .inverted = false,
+        .toggle = false,
+    };
+
     Button button;
     bool last_button_value;
     const float x;
     const float y;
-    const Common::Input::AnalogProperties properties{0.0f, 1.0f, 0.5f, 0.0f, false};
 };
 
 std::unique_ptr<Common::Input::InputDevice> TouchFromButton::Create(