Update flymake -error, -warning, and -note to match flycheck

[krzysz00]

This commit updates the faces for Flymake's reported errors, warnings, and notes to make them more visible in non-GUI environments.

The faces were copied from their flycheck counterparts for consistency.

Before

After

Screenshots from a 24-bit true-color terminal

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Before submitting a PR make sure the following things have been done (and denote this
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) (N/A)

Thanks!

[bbatsov]

Thanks!