I18N: Remove unnecessary `__()` calls in `_rotate_image_resource()` and `_flip_image_resource()`.

Use `_deprecated_function()`'s native strings.

Props ramiy.
Fixes #38862.
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git-svn-id: https://core.svn.wordpress.org/trunk@39254 1a063a9b-81f0-0310-95a4-ce76da25c4cd