Update test/sanitizer_suppressions/lsan

Summary:

With Qt 5.15.2 in depends it seems we can drop some Leak Sanitizer suppressions now.

Backport of core#23964.

Test Plan:

./contrib/teamcity/build-configurations.py build-tsan

Reviewers: #bitcoin_abc, PiRK

Reviewed By: #bitcoin_abc, PiRK

Differential Revision: https://reviews.bitcoinabc.org/D17979