test: Remove incorrect and unused try-block in assert_debug_log
test: Remove incorrect and unused try-block in assert_debug_log

Summary: This is a backport of Core [[https://github.com/bitcoin/bitcoin/pull/16804 | PR16804]]

Test Plan:
  ninja all check-all

Reviewers: #bitcoin_abc, Fabien

Reviewed By: #bitcoin_abc, Fabien

Differential Revision: https://reviews.bitcoinabc.org/D5939

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