Use commas to separate header objects.

[maliming]

Fix #7031

public Task Test([FromHeader] string mystr1, [FromHeader] string mystr2)
{
    return Task.CompletedTask;
}

(function(){
  abp.utils.createNamespace(window, 'volo.abp.aspNetCore.mvc.uI.bootstrap.demo.pages.test');

  volo.abp.aspNetCore.mvc.uI.bootstrap.demo.pages.test.test = function(mystr1, mystr2, ajaxParams) {
    return abp.ajax($.extend(true, {
      url: abp.appPath + 'api/app/test/test',
      type: 'POST',
      dataType: null,
      headers: {
        'mystr1': mystr1, 
        'mystr2': mystr2
      }
    }, ajaxParams));
  };

})();