MDEV-22227 Assertion `state_ == s_exec' failed in wsrep::client_state::start_transaction

Removed redundant code for BF abort transaction in `thr_lock.cc`.

TOI operations will ignore provided lock_wait_timeout and use `LONG_TIMEOUT`
until operation is finished.

Reviewed-by: Jan Lindström <jan.lindstrom@mariadb.com>

sql/sql_class.h

@@ -615,6 +615,7 @@ typedef struct system_variables
     are based on the cluster size):
   */
   ulong saved_auto_increment_increment, saved_auto_increment_offset;
+  ulong saved_lock_wait_timeout;
 #endif /* WITH_WSREP */
   uint eq_range_index_dive_limit;
   ulong column_compression_zlib_strategy;