scripted-diff: Rename PRUNED to SPENT in coins tests

Summary:

sed -i -e 's/PRUNED/SPENT/g' ./src/test/coins_tests.cpp

This is a backport of Core PR18410 [2/3]
https://github.com/bitcoin/bitcoin/pull/18410/commits/e9936966c08bd8a6ac02828131f619ddaa1ced13

Depends on D8953

Test Plan: ninja check

Reviewers: #bitcoin_abc, Fabien

Reviewed By: #bitcoin_abc, Fabien

Differential Revision: https://reviews.bitcoinabc.org/D8954