Agile plugin plugin styling issues #3

[pbystrov]

Agile swimlane icons are styled differently and always in expanded state:

I checked browser's inspect view and this is probably caused by additional classes for the same elements on Agile page:

...
<tr class="group swimlane" data-id="35">
    <td colspan="4">
    <span class="expander icon icon-expended" onclick="toggleRowGroup(this);">&nbsp;</span>
...

While swimlanes on the issues tab look like this:

...
<tr class="group">
    <td colspan="15">
    <span class="expander" onclick="toggleRowGroup(this);">&nbsp;</span>
...

Environment:

  Redmine version                4.0.0.stable
  Ruby version                   2.3.3-p222 (2016-11-21) [x86_64-linux-gnu]
  Rails version                  5.2.2
  Environment                    production
  Database adapter               Mysql2
  Mailer queue                   ActiveJob::QueueAdapters::AsyncAdapter
  Mailer delivery                smtp
SCM:
  Git                            2.11.0
  Filesystem                     
Redmine plugins:
  additionals                    2.0.23
  clipboard_image_paste          1.13
  redmine_agile                  1.5.4
  redmine_checklists             3.1.18
  redmine_contacts               4.3.2
  redmine_contacts_helpdesk      4.1.10
  redmine_custom_workflows       1.0.1
  redmine_favorite_projects      2.1.0
  redmine_percent_done           1.1.0
  redmine_reporter               1.0.3
  redmine_theme_changer          0.4.0
  redmine_zenedit                1.0.3
  redmineup_tags                 2.0.8