MINOR: stick-table: make skttable_data_cast to use only std types

This patch replaces all advanced data type aliases on
stktable_data_cast calls by standard types.

This way we could call the same stktable_data_cast
regardless of the used advanced data type as long they
are using the same std type.

It also removes all the advanced data type aliases.
diff --git a/src/session.c b/src/session.c
index 0f26588..4789ca9 100644
--- a/src/session.c
+++ b/src/session.c
@@ -119,11 +119,11 @@
 
 		ptr = stktable_data_ptr(stkctr->table, stkctr_entry(stkctr), STKTABLE_DT_SESS_CNT);
 		if (ptr)
-			HA_ATOMIC_INC(&stktable_data_cast(ptr, sess_cnt));
+			HA_ATOMIC_INC(&stktable_data_cast(ptr, std_t_uint));
 
 		ptr = stktable_data_ptr(stkctr->table, stkctr_entry(stkctr), STKTABLE_DT_SESS_RATE);
 		if (ptr)
-			update_freq_ctr_period(&stktable_data_cast(ptr, sess_rate),
+			update_freq_ctr_period(&stktable_data_cast(ptr, std_t_frqp),
 					       stkctr->table->data_arg[STKTABLE_DT_SESS_RATE].u, 1);
 	}
 }