Fix greediness of greedy arguments if they have sub arguments

Even sub arguments (e.g. `--help`) should be treated as values to be passed
to a nested argument parser (as documented). The sub arguments are only
added in this case to appear in the help.

application/argumentparser.cpp

@@ -361,6 +361,9 @@ bool ArgumentReader::read(ArgumentVector &args)
             ++parser.m_actualArgc;
             lastArg = lastArgInLevel = matchingArg;
             argDenotation = nullptr;
+            if ((values->size() < matchingArg->requiredValueCount()) && (matchingArg->flags() & Argument::Flags::Greedy)) {
+                continue;
+            }
             read(lastArg->m_subArgs);
             argDenotation = nullptr;
             continue;