Fix - Improper validation of Signature field attachment paths

[NirajChaudhary143]

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Changelog entry

Fix - Improper validation of Signature field attachment paths.

[deepench]

@NirajChaudhary143 wp_get_upload_dir() is internally cached by WordPress but wp_normalize_path() + trailingslashit() runs on every iteration. For entries with dozens of fields, this is needless work. Move both assignments before the foreach loop.