[wp-trac] [WordPress Trac] #57527: Duotone: Two minor code quality fixes

[WordPress Trac]

#57527: Duotone: Two minor code quality fixes
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 Reporter:  Mamaduka     |      Owner:  (none)
     Type:  enhancement  |     Status:  new
 Priority:  normal       |  Milestone:  Awaiting Review
Component:  Editor       |    Version:
 Severity:  normal       |   Keywords:
  Focuses:               |
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 Backports following changes from the Gutenberg plugin

 * Use in/decrementors where appropriate. They're more performant than an
 assignment with a calculation.
 * Don't check if constants set by `wp_initial_constants()` are defined.

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Ticket URL: <https://core.trac.wordpress.org/ticket/57527>
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