Add functional test for blockfilterindex in prune-mode

test/functional/test_runner.py

@@ -288,6 +288,7 @@ BASE_SCRIPTS = [
     'feature_help.py',
     'feature_shutdown.py',
     'p2p_ibd_txrelay.py',
+    'feature_blockfilterindex_prune.py'
     # Don't append tests at the end to avoid merge conflicts
     # Put them in a random line within the section that fits their approximate run-time
 ]