Weird subtitle position

*I'm submitting a ...*
- [x ] bug report
- [ ] feature request
- [ ] support request

## General infomration

### Prerequisites

* [x] Are you running the latest version?
Yes, 0.13.22

### Description

Subtitles look weird when there are two lines of subtitles.
First line looks great, but the second line (which should be positioned under the first line) is positioned above first line, around center of the screen.
When there is only one line of the subtitle, the position is okay and everything looks perfect.
I did calibration and subtitle position is set to fixed.

At first I thought this is the OSMC issue, but then I installed HBOGo Addon which shows subtitles normally.

### Steps to Reproduce

1. Play any video with subtitles

**Expected behavior:** Second line of the subtitles positioned under the first line

**Actual behavior:** Second line of the subtitles positioned above the first line

## Context (Environment)
Netflix addon on a RPi 3B

### Installation

* [x ] I installed the plugin via zip from the Releases page
* [ ] I´m using the Netflix Repo
* [ ] I´m using a different source (Please tell which)

### Operating System

* [ ] Linux (x86/x64)
* [ ] OSX (x86/x64)
* [ ] Windows (x86/x64)
* [x ] Linux (ARM)
* [ ] Android

No file, test, or entry point is named. Start by reproducing the issue from the listed Netflix addon and Raspberry Pi 3B environment with a two-line subtitle, then trace where subtitle positioning is handled. Done means the second line appears below the first while single-line subtitles remain correctly positioned.

Written by the indexing model from the issue text.