configure_input: Hook up the vibration percentage spinbox

This allows setting the vibration strength percentage anywhere from 1% to 100%.
Also hooks up the remaining motion button and checkbox in the Controller Applet.

src/core/settings.cpp

@@ -150,6 +150,7 @@ void RestoreGlobalState() {
     values.players.SetGlobal(true);
     values.use_docked_mode.SetGlobal(true);
     values.vibration_enabled.SetGlobal(true);
+    values.vibration_strength.SetGlobal(true);
     values.motion_enabled.SetGlobal(true);
 }