Subtitle with Italic Font leaves space between lines

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

## General infomration

### Prerequisites

* [x] Are you running the latest version?

### Description

When subtitle has 2 lines and in italic format (style from original subtitles not KODI settings), leaves an empty line between them. Character encoding, font, size, style doesn't fix nothing. But I use Arial Bold 26 as my default font.

### Steps to Reproduce

1. [First Step]
Play the Video
2. [Second Step]
Select Subtitle (no mater the language)
3. [Third Step]
Find a subtitle that appeared with italic (for example song lyrics, or voice on phone). I detect that the show "Boss Baby Back in Business" intro music have lyrics with italic style.

**Expected behavior:** [What you expected to happen]

SubtitleLine1
SubtitleLine2

**Actual behavior:** [What actually happened]

SubtitleLine1

SubtitleLine2

## Context (Environment)

### Installation

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

### Operating System

* [ ] Linux (x86/x64)
* [ ] OSX (x86/x64)
* [x] Windows 10 (x64)
* [ ] Linux (ARM)
* [ ] Android

### Screenshots


No source file or test is identified in the issue. First reproduce on Windows 10 by playing a video and selecting a subtitle with two italic lines, such as the Boss Baby: Back in Business intro lyrics. Done means the two subtitle lines render consecutively without an empty line between them.

Written by the indexing model from the issue text.