android: Add relative stick center toggle

src/android/app/src/main/java/org/yuzu/yuzu_emu/fragments/EmulationFragment.kt

@@ -222,6 +222,8 @@ class EmulationFragment : Fragment(), SurfaceHolder.Callback {
 
         popup.menuInflater.inflate(R.menu.menu_overlay_options, popup.menu)
 
+        popup.menu.findItem(R.id.menu_rel_stick_center).isChecked = EmulationMenuSettings.joystickRelCenter
+
         popup.setOnMenuItemClickListener {
             when (it.itemId) {
                 R.id.menu_edit_overlay -> {
@@ -259,6 +261,11 @@ class EmulationFragment : Fragment(), SurfaceHolder.Callback {
 
                     true
                 }
+                R.id.menu_rel_stick_center -> {
+                    it.isChecked = !it.isChecked
+                    EmulationMenuSettings.joystickRelCenter = it.isChecked
+                    true
+                }
                 R.id.menu_reset_overlay -> {
                     binding.drawerLayout.close()
                     resetInputOverlay()

src/android/app/src/main/res/menu/menu_overlay_options.xml

@@ -9,6 +9,11 @@
         android:id="@+id/menu_toggle_controls"
         android:title="@string/emulation_toggle_controls" />
 
+    <item
+        android:id="@+id/menu_rel_stick_center"
+        android:title="@string/emulation_rel_stick_center"
+        android:checkable="true" />
+
     <item
         android:id="@+id/menu_reset_overlay"
         android:title="@string/emulation_touch_overlay_reset" />

src/android/app/src/main/res/values/strings.xml

@@ -87,6 +87,7 @@
     <string name="emulation_exit">Exit Emulation</string>
     <string name="emulation_done">Done</string>
     <string name="emulation_toggle_controls">Toggle Controls</string>
+    <string name="emulation_rel_stick_center">Relative Stick Center</string>
     <string name="emulation_toggle_all">Toggle All</string>
     <string name="emulation_control_scale">Adjust Scale</string>
     <string name="emulation_touch_overlay_reset">Reset Overlay</string>