fix sorting of select-multiple-dropdown values

[azrikahar]

Fixes #10639

Before

When we do the following:

1. untick & tick Bold again
2. tick Background Color
3. tick Foreground Color

The expectation is these 3 will be at the start of the toolbar. However currently they end up at the last positions instead based on our tick order:

BiMwvRMlmh.mp4

After

ORfR4B4Jil.mp4

[benhaynes]

Nice!! Since you're in this code, is it possible to predefine a proper order for these wysiwyg buttons that matches most editors?

Typically bold, italic, and underline would come first, etc...

It'd be cool if these formatting options were manually reorderable... but that's for another day.

[azrikahar]

Sure thing 👍 Tried to cross reference it among other WYSIWYG editors but came across this TinyMCE example:

(from https://codepen.io/tinymce/pen/qBWLLMP)

Is this ordering okay?

[benhaynes]

Looks great! Thank you...

[rijkvanzanten]

@azrikahar lets put that change on a new pr 👍🏻