Revert "Added new filter 'ninja_forms_export_sub_pre_value' which makes the user_value available to be changed before the strip slashes and implode_r if it's an array."

This reverts commit fd72a28fee4446a413ecb1b5621e00dc76b18155.
Revert "Merge remote-tracking branch 'upstream/develop' into develop"

This reverts commit 7962b1423e7bcb1631efbb058750dc649ebe4a9f, reversing
changes made to fd72a28fee4446a413ecb1b5621e00dc76b18155.