Remove deprecated function and prevent errors in case of a null fragment name

androidApp/src/main/java/bou/amine/apps/readerforselfossv2/android/settings/SettingsActivity.kt

@@ -74,15 +74,17 @@ class SettingsActivity : AppCompatActivity(),
         caller: PreferenceFragmentCompat,
         pref: Preference
     ): Boolean {
+        val fragmentClassName = pref.fragment ?: return false
+
         // Instantiate the new Fragment
         val args = pref.extras
         val fragment = supportFragmentManager.fragmentFactory.instantiate(
             classLoader,
-                pref.fragment
+            fragmentClassName
         ).apply {
             arguments = args
-            setTargetFragment(caller, 0)
         }
+
         // Replace the existing Fragment with the new Fragment
         supportFragmentManager.beginTransaction()
             .replace(R.id.settings, fragment)