tools/hcitool: Change connection handle condition for lecup

According to BLUETOOTH SPECIFICATION Version 5.0 | Vol 2, Part E
7.8.18 LE Connection Update Command, connection handle range is
0x0000-0x0EFF.
diff --git a/tools/hcitool.c b/tools/hcitool.c
index 02c4ebe..945f675 100644
--- a/tools/hcitool.c
+++ b/tools/hcitool.c
@@ -3351,7 +3351,7 @@
 		timeout = strtoul(argv[4], NULL, 0);
 	}
 
-	if (handle == 0) {
+	if (handle > 0x0EFF) {
 		printf("%s", lecup_help);
 		return;
 	}