motion touch ui: move remaining connection out of .ui file

Two reasons for this:
1. Out of 7 connections, 6 are in ConfigureMotionTouch::ConnectEvents,
   this is the outlier.
2. Qt6 doesn't moc the connection properly

src/yuzu/configuration/configure_motion_touch.cpp

@@ -151,6 +151,8 @@ void ConfigureMotionTouch::ConnectEvents() {
             &ConfigureMotionTouch::OnConfigureTouchCalibration);
     connect(ui->touch_from_button_config_btn, &QPushButton::clicked, this,
             &ConfigureMotionTouch::OnConfigureTouchFromButton);
+    connect(ui->buttonBox, &QDialogButtonBox::accepted, this,
+            &ConfigureMotionTouch::ApplyConfiguration);
     connect(ui->buttonBox, &QDialogButtonBox::rejected, this, [this] {
         if (CanCloseDialog()) {
             reject();

src/yuzu/configuration/configure_motion_touch.ui

@@ -293,22 +293,5 @@
   </layout>
  </widget>
  <resources/>
- <connections>
-  <connection>
-   <sender>buttonBox</sender>
-   <signal>accepted()</signal>
-   <receiver>ConfigureMotionTouch</receiver>
-   <slot>ApplyConfiguration()</slot>
-   <hints>
-    <hint type="sourcelabel">
-     <x>20</x>
-     <y>20</y>
-    </hint>
-    <hint type="destinationlabel">
-     <x>20</x>
-     <y>20</y>
-    </hint>
-   </hints>
-  </connection>
- </connections>
+ <connections/>
 </ui>