Remove explicit option to store downloads in app data folder

App data is typically deleted during app uninstallation, which some users are unaware of. The folder is also inaccessible externally by default in Android 11+, which is also annoying to users.

app/src/main/java/eu/kanade/tachiyomi/ui/setting/SettingsDownloadController.kt

@@ -6,7 +6,6 @@ import android.content.ActivityNotFoundException
 import android.content.Intent
 import android.os.Bundle
 import android.os.Environment
-import androidx.core.content.ContextCompat
 import androidx.core.net.toUri
 import androidx.core.text.buildSpannedString
 import androidx.preference.PreferenceScreen
@@ -210,7 +209,7 @@ class SettingsDownloadController : SettingsController() {
         override fun onCreateDialog(savedViewState: Bundle?): Dialog {
             val activity = activity!!
             val currentDir = preferences.downloadsDirectory().get()
-            val externalDirs = (getExternalDirs() + File(activity.getString(R.string.custom_dir))).map(File::toString)
+            val externalDirs = listOf(getDefaultDownloadDir(), File(activity.getString(R.string.custom_dir))).map(File::toString)
             var selectedIndex = externalDirs.indexOfFirst { it in currentDir }
 
             return MaterialAlertDialogBuilder(activity)
@@ -229,13 +228,12 @@ class SettingsDownloadController : SettingsController() {
                 .create()
         }
 
-        private fun getExternalDirs(): List<File> {
+        private fun getDefaultDownloadDir(): File {
             val defaultDir = Environment.getExternalStorageDirectory().absolutePath +
                 File.separator + resources?.getString(R.string.app_name) +
                 File.separator + "downloads"
 
-            return mutableListOf(File(defaultDir)) +
-                ContextCompat.getExternalFilesDirs(activity!!, "").filterNotNull()
+            return File(defaultDir)
         }
     }