Remove predefined setting for shared_buffers

Author: ildus

testgres/testgres.py

@@ -308,7 +308,6 @@ def init(self, allows_streaming=False, initdb_params=[]):
                     "max_wal_senders = 5\n"
                     "wal_keep_segments = 20\n"
                     "max_wal_size = 128MB\n"
-                    "shared_buffers = 128MB\n"
                     "wal_log_hints = on\n"
                     "hot_standby = on\n"
                     "max_connections = 10\n")