Editor: Fix preloaded REST API paths

[Mamaduka]

Gutenberg PR: WordPress/gutenberg#64401 and WordPress/gutenberg#64459.
Trac ticket: https://core.trac.wordpress.org/ticket/61884

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Props mamaduka.

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[getsource]

This looks good to me, thank you @Mamaduka !

[Mamaduka]

Committed https://core.trac.wordpress.org/changeset/58904.