Fix drive selection issue on Android

[syntaxerror247]

Fixes #64809

[Alex2782]

On which devices have you tested it so far? (+Android version)

[syntaxerror247]

On which devices have you tested it so far? (+Android version)

Moto g9 play Android 11 and Android 16 emulator.

[syntaxerror247]

Note: getDrive() method only works on API 30+ because storageVolume.getDirectory() is added in API 30 and I couldn't find any other reliable way to get the drive path on older versions.

[Alex2782]

Tested on Samsung Tab S7, Android 13, changing path to an SD card worked.

I was able to find a code for Android 7-10 to read paths (link), but changing the path didn't work. (see below) If anyone knows the cause, we can create a new PR.

---

FileDialog test on MacOS

I checked the behavior more closely under macOS with several external USB hard drives; FileDialog::_select_drive requires a path and doesn't work with a name.

void FileDialog::_select_drive(int p_idx) {
	String d = drives->get_item_text(p_idx);
	_change_dir(d);
	filename_edit->set_text("");
	_push_history();
}

---

Code for Android 7 - 10

	override fun getDrive(drive: Int): String {
		if (drive < 0 || drive >= storageManager.storageVolumes.size) {
			return ""
		}

		val storageVolume = storageManager.storageVolumes[drive]
		return if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R) {
			storageVolume.directory?.absolutePath ?: ""
		} else {
			@SuppressLint("DiscouragedPrivateApi")
			try {
				val method = storageVolume.javaClass.getMethod("getPath")
				method.invoke(storageVolume) as? String ?: ""
			} catch (e: Exception) {
				""
			}
		}
	}

[Repiteo]

Thanks!