acc: use the dependencies function to register dlg ctx

This is a temporary fix, until we figure out a way of registering the
dlg ctx index only if cdr is used.

modules/acc/acc_logic.c

@@ -1095,8 +1095,6 @@ unsigned long long do_acc_flags_parser(str* token)
 					LM_ERR("cannot register callback for dialog loaded - accounting "
 							"for ongoing calls will be lost after restart\n");
 
-			acc_dlg_ctx_idx = dlg_api.dlg_ctx_register_ptr(unref_acc_ctx);
-
 			is_cdr_enabled=1;
 		}
 

modules/acc/acc_mod.c

@@ -255,14 +255,20 @@ static dep_export_t deps = {
 	},
 };
 
+static int acc_deps(void)
+{
+	acc_dlg_ctx_idx = dlg_api.dlg_ctx_register_ptr(unref_acc_ctx);
+	return 0;
+}
+
 struct module_exports exports= {
 	"acc",
 	MOD_TYPE_DEFAULT,/* class of this module */
 	MODULE_VERSION,  /* module version */
 	DEFAULT_DLFLAGS, /* dlopen flags */
 	0,				 /* load function */
 	&deps,           /* OpenSIPS module dependencies */
-	0,               /* OpenSIPS dependencies function */
+	acc_deps,        /* OpenSIPS dependencies function */
 	cmds,       /* exported functions */
 	0,          /* exported async functions */
 	params,     /* exported params */