MT#55283 support leading spaces in string dict

Allow usage of `key=[ something ]` in rtpp_flags

One test is affected

Change-Id: Ib3d68f298d2e0cd02c74bf2c7d3d02b055223bc4

daemon/control_ng_flags_parser.c

@@ -79,6 +79,8 @@ static int rtpp_is_dict_list(rtpp_pos *a) {
 	if (!skip_char(&list, '['))
 		return 0;
 	// check contents
+	if (list.len == 0)
+		list = a->remainder; // could be just leading spaces?
 	if (list.len == 0)
 		return 0; // unexpected end of string
 	if (list.s[0] == '[')

t/auto-daemon-tests-rtpp-flags.pl

@@ -627,7 +627,7 @@ a=test
 a=quux
 ----------------------------------
 v=0
-o=- 1545997027 1 IN IP4 198.51.100.1
+o=- 1545997027 1 IN IP4 203.0.113.1
 s=tester
 t=0 0
 a=quux