Fix permissions issue with global leak blacklist

[jonathanmetzman]

at .rpc_call ( /mnt/scratch0/clusterfuzz/src/third_party/google/cloud/ndb/_datastore_api.py:97 )
at ._advance_tasklet ( /mnt/scratch0/clusterfuzz/src/third_party/google/cloud/ndb/tasklets.py:312 )
at .retry_wrapper ( /mnt/scratch0/clusterfuzz/src/third_party/google/cloud/ndb/_retry.py:72 )
at .retry_wrapper ( /mnt/scratch0/clusterfuzz/src/third_party/google/cloud/ndb/_retry.py:77 )
at ._advance_tasklet ( /mnt/scratch0/clusterfuzz/src/third_party/google/cloud/ndb/tasklets.py:312 )
at ._datastore_run_query ( /mnt/scratch0/clusterfuzz/src/third_party/google/cloud/ndb/_datastore_query.py:878 )
at ._advance_tasklet ( /mnt/scratch0/clusterfuzz/src/third_party/google/cloud/ndb/tasklets.py:312 )
at ._next_batch ( /mnt/scratch0/clusterfuzz/src/third_party/google/cloud/ndb/_datastore_query.py:297 )
at ._advance_tasklet ( /mnt/scratch0/clusterfuzz/src/third_party/google/cloud/ndb/tasklets.py:312 )
at .has_next_async ( /mnt/scratch0/clusterfuzz/src/third_party/google/cloud/ndb/_datastore_query.py:267 )
at ._advance_tasklet ( /mnt/scratch0/clusterfuzz/src/third_party/google/cloud/ndb/tasklets.py:312 )
at .check_success ( /mnt/scratch0/clusterfuzz/src/third_party/google/cloud/ndb/tasklets.py:140 )
at .result ( /mnt/scratch0/clusterfuzz/src/third_party/google/cloud/ndb/tasklets.py:193 )
at .has_next ( /mnt/scratch0/clusterfuzz/src/third_party/google/cloud/ndb/_datastore_query.py:261 )
at .next ( /mnt/scratch0/clusterfuzz/src/third_party/google/cloud/ndb/_datastore_query.py:336 )
at .copy_global_to_local_blacklist ( /mnt/scratch0/clusterfuzz/src/clusterfuzz/_internal/fuzzing/leak_blacklist.py:84 )
at .setup_testcase ( /mnt/scratch0/clusterfuzz/src/clusterfuzz/_internal/bot/tasks/setup.py:299 )
at .utask_main ( /mnt/scratch0/clusterfuzz/src/clusterfuzz/_internal/bot/tasks/utasks/variant_task.py:116 )
at .uworker_main ( /mnt/scratch0/clusterfuzz/src/clusterfuzz/_internal/bot/tasks/utasks/init.py:202 )
at .uworker_bot_main ( /mnt/scratch0/clusterfuzz/src/clusterfuzz/_internal/bot/tasks/utasks/init.py:220 )
at .task_loop ( /mnt/scratch0/clusterfuzz/src/python/bot/startup/run_bot.py:123 )