Fixed levels widget styling

[Robin-K-Lynn]

Changed the text format from MarkdownText to StyledText and removed the inline code formatting. This fixes font size calculation and keeps the text styling and line break.

[Robin-K-Lynn]

I am running Friture on Linux, before this patch, the side bar numbers are over sized

With the changes it looks like this

[Robin-K-Lynn]

Possibly related to scaling from issue #249

[tlecomte]

@Robin-K-Lynn Hmm, I'm not sure about this one.
The intent behind using markdown was to use a markdown codeblock, so that the text would be rendered using a monospace font. With a non-monospace font, the width of characters are all different, so the digits would constantly move left and right.

[Robin-K-Lynn]

Ah, yes, I didn't think of that as my system's default font happens to have monospacing for all numbers. I've changed the font family to monospace to address that.

Not using code blocks avoids the issues with scaling and unwanted margins which are system dependant.

[tlecomte]

Thanks. I also like that it makes the intent of the code a bit clearer.