dict_table_t::init_instant(): Remove a bogus assertion

This is basically re-applying 8fe34dd4.
Assertions about ROW_FORMAT not changing during instant ALTER TABLE can
fail if the MariaDB and InnoDB data dictionaries get out of sync,
for example if innodb_default_row_format is used instead of specifying
ROW_FORMAT in the CREATE TABLE statement. In this case, ALTER_OPTIONS
would not necessarily be set. We would create the ctx->instant_table
with a ROW_FORMAT based on altered_table. When applying it to
the ctx->old_table, we will preserve the original ROW_FORMAT.

storage/innobase/handler/handler0alter.cc

@@ -171,7 +171,6 @@ inline void dict_table_t::init_instant(const dict_table_t& table)
 	dict_index_t& index = *indexes.start;
 	const unsigned u = index.first_user_field();
 	DBUG_ASSERT(u == oindex.first_user_field());
-	DBUG_ASSERT(not_redundant() == table.not_redundant());
 	DBUG_ASSERT(index.n_fields >= oindex.n_fields);
 
 	field_map_element_t* field_map_it = static_cast<field_map_element_t*>(