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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Before submitting a PR make sure the following things have been done (and denote this by checking the relevant checkboxes):

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

Thanks!