Highlight font-lock-number-face as highlight-numbers-number

[imustafin]

We already support highlight-numbers (by highlighting highlight-numbers-number). This PR uses the same font for font-lock (highlighting font-lock-number-face).

This fixes the inconsistency if you use both highlight-numbers and something which uses font-lock. For example, ruby-mode and ruby-ts-mode. For example, notice how the numbers are not highlighted only in the top-left cell in the following table:

Before	After

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by checking the relevant checkboxes):

• You've added a before/after screenshot illustrating visually your changes.
• You've updated the readme (if adding/changing configuration options)

Thanks!

[thomasf]

This theme aims to be minimalist, I don't think anything that could enable different colors for numbers unless the user opts in to it by enabling a specific mode or customization is a good fit.

Having said that, I just took a quick look at a couple of programming modes and the font-lock-number-face wasn't applied to numbers in either one of them.

In any case, if you really think it's important, add a defcustom that defaults to being off for it.

[thomasf]

This is a very similar kind of customization

(defcustom solarized-distinct-doc-face nil
  "Make `font-lock-doc-face' stand out more.
Related discussion: https://github.com/bbatsov/solarized-emacs/issues/158"
  :type 'boolean
  :group 'solarized)