android: Convert SubmenuSetting to Kotlin

src/android/app/src/main/java/org/yuzu/yuzu_emu/features/settings/model/view/SubmenuSetting.java

@@ -1,21 +0,0 @@
-package org.yuzu.yuzu_emu.features.settings.model.view;
-
-import org.yuzu.yuzu_emu.features.settings.model.Setting;
-
-public final class SubmenuSetting extends SettingsItem {
-    private String mMenuKey;
-
-    public SubmenuSetting(String key, Setting setting, int titleId, int descriptionId, String menuKey) {
-        super(key, null, setting, titleId, descriptionId);
-        mMenuKey = menuKey;
-    }
-
-    public String getMenuKey() {
-        return mMenuKey;
-    }
-
-    @Override
-    public int getType() {
-        return TYPE_SUBMENU;
-    }
-}

src/android/app/src/main/java/org/yuzu/yuzu_emu/features/settings/model/view/SubmenuSetting.kt

@@ -0,0 +1,15 @@
+package org.yuzu.yuzu_emu.features.settings.model.view
+
+import org.yuzu.yuzu_emu.features.settings.model.Setting
+
+class SubmenuSetting(
+    key: String?,
+    setting: Setting?,
+    titleId: Int,
+    descriptionId: Int,
+    val menuKey: String
+) : SettingsItem(
+    key, null, setting, titleId, descriptionId
+) {
+    override val type = TYPE_SUBMENU
+}