Restore args conversion of {"k":"v"} to tuple lists in mod_http_api

Switching to json compatible output did broke this, which caused issues in
for example create_rooms_with_opts command.

src/mod_http_api.erl

@@ -332,6 +332,14 @@ format_arg({Elements},
 		 ({Val}) when is_list(Val) ->
 		      format_arg({Val}, Tuple)
 	      end, Elements);
+format_arg(Map,
+	   {list, {_ElementDefName, {tuple, [{_Tuple1N, Tuple1S}, {_Tuple2N, Tuple2S}]}}})
+    when is_map(Map) andalso
+	 (Tuple1S == binary orelse Tuple1S == string) ->
+    maps:fold(
+	fun(K, V, Acc) ->
+	    [{format_arg(K, Tuple1S), format_arg(V, Tuple2S)} | Acc]
+	end, [], Map);
 format_arg(Elements,
 	   {list, {_ElementDefName, {list, _} = ElementDefFormat}})
     when is_list(Elements) ->

test/commands_tests.erl

@@ -47,7 +47,8 @@ single_cases() ->
       single_test(http_restuple),
       single_test(http_list),
       single_test(http_tuple),
-      single_test(http_list_tuple)]}.
+      single_test(http_list_tuple),
+      single_test(http_list_tuple_map)]}.
 
 setup(_Config) ->
     M = <<"mod_example">>,
@@ -139,6 +140,13 @@ http_list_tuple(Config) ->
     ?match(LTB, query(Config, "command_test_list_tuple", #{arg_list => LTA})),
     ?match(LTB, query(Config, "command_test_list_tuple", #{arg_list => LTB})).
 
+http_list_tuple_map(Config) ->
+    LTA = #{<<"one">> => <<"uno">>, <<"dos">> => <<"two">>, <<"three">> => <<"tres">>},
+    LTB = lists:sort([#{<<"element1">> => <<"one">>, <<"element2">> => <<"uno">>},
+                      #{<<"element1">> => <<"dos">>, <<"element2">> => <<"two">>},
+                      #{<<"element1">> => <<"three">>, <<"element2">> => <<"tres">>}]),
+    ?match(LTB, lists:sort(query(Config, "command_test_list_tuple", #{arg_list => LTA}))).
+
 %%%==================================
 %%%% internal functions