fix lint 2

Author: igagis

src/ruis/widget/base/touch/flickable.cpp

@@ -26,8 +26,12 @@ along with this program. If not, see <http://www.gnu.org/licenses/>.
 
 using namespace ruis::touch;
 
+namespace {
+constexpr auto friction_coefficient = 0.005;
+} // namespace
+
 flickable::flickable(utki::shared_ref<ruis::context> context) :
-	friction(context.get().units.dots_per_pp() * ruis::real(0.005)) // TODO: magic constant
+	friction(context.get().units.dots_per_pp() * ruis::real(friction_coefficient))
 {}
 
 ruis::event_status flickable::on_mouse_button(const mouse_button_event& event)