acc: Fix drop_accounting() (do not be a NOOP!)

The bug here was that `drop_accounting()` was building its bitmask as:

    flag_mask = types * flags;

... whereas it should have done the same as in `do_accounting()`:

    flag_mask = types + types * flags;
                -------
		^ the actual acc types to reset were missing!

(cherry picked from commit 211a63c)

modules/acc/acc_logic.c

@@ -1378,10 +1378,10 @@ int w_do_acc(struct sip_msg* msg, unsigned long long *type,
 	return 1;
 }
 
-int w_drop_acc(struct sip_msg* msg, unsigned long long *type,
+int w_drop_acc(struct sip_msg* msg, unsigned long long *types,
 			unsigned long long *flags)
 {
-	unsigned long long flag_mask;
+	unsigned long long flag_mask, _types, _flags;
 
 	acc_ctx_t* acc_ctx=try_fetch_ctx();
 
@@ -1391,9 +1391,10 @@ int w_drop_acc(struct sip_msg* msg, unsigned long long *type,
 		return -1;
 	}
 
-	flag_mask = (type ? *type : DO_ACC_LOG | DO_ACC_AAA | DO_ACC_DB | DO_ACC_EVI) *
-		(flags ? *flags : ALL_ACC_FLAGS);
+	_types = (types ? *types : DO_ACC_LOG|DO_ACC_AAA|DO_ACC_DB|DO_ACC_EVI);
+	_flags = (flags ? *flags : ALL_ACC_FLAGS);
 
+	flag_mask = _types + _types * _flags;
 	reset_flags(acc_ctx->flags, flag_mask);
 
 	return 1;

modules/acc/acc_logic.h

@@ -33,11 +33,11 @@
 #include "../tm/t_hooks.h"
 #include "../dialog/dlg_cb.h"
 
-#define DO_ACC_NONE (0)
-#define DO_ACC_LOG  (1<<(0*8))
-#define DO_ACC_AAA  (1<<(1*8))
-#define DO_ACC_DB   (1<<(2*8))
-#define DO_ACC_EVI  ((unsigned long long)1<<(4*8))
+#define DO_ACC_NONE (0ULL)
+#define DO_ACC_LOG  (1ULL<<(0*8))
+#define DO_ACC_AAA  (1ULL<<(1*8))
+#define DO_ACC_DB   (1ULL<<(2*8))
+#define DO_ACC_EVI  (1ULL<<(4*8))
 #define DO_ACC_ERR  ((unsigned long long)-1)
 
 #define DO_ACC        (1<<0) /* generic accouting flag - internal only */