Disabling usage of task argument name for now

The only check is whether the argument name is set to not nullptr,
and in cases when it is never set, it can create garbage strings
in the trace. disable for now.

src/apex/taskstubs_implementation.cpp

@@ -229,12 +229,11 @@ extern "C" {
                 default:
                     break;
             }
-            if (arguments[i].name != nullptr) {
+            if (false) { // arguments[i].name != nullptr) {
                 apex_timer->argument_names.push_back(std::string(arguments[i].name));
             } else {
-                std::string tmpname{"arg["};
+                std::string tmpname{"arg_"};
                 tmpname = tmpname + std::to_string(i+2); // add two, because GUID and parent GUID are 0,1
-                tmpname = tmpname + "]";
                 apex_timer->argument_names.push_back(tmpname);
             }
         }