Select tour step order has no name

Looks like an Admin level violation caught in the automated tests (env tests -> master -> #506):
```
Validation in the test method [verifyTourFeatures]
Check for [org.xwiki.tour.test.po.StepEditModal] at http://xwikiweb:8080/xwiki/bin/edit/Tour/Test/WebHome?form_token=Fq5m5adIcA3TSSLObuoxyQ&template=TourCode.TourTemplate&title=Test&parent=Tour.WebHome&editor=inline#.
Found [1] items

1: Select element must have an accessible name
Description: Ensures select element has an accessible name
Help URL: https://dequeuniversity.com/rules/axe/4.8/select-name?application=axeAPI
Help: Select element must have an accessible name
Impact: critical
Tags: cat.forms, wcag2a, wcag412, section508, section508.22.n, TTv5, TT5.c, EN-301-549, EN-9.4.1.2, ACT

HTML element:
<select id="stepOrderSelect">
<option selected="selected" value="0">1</option>
</select>
Selector: stepOrderSelect
Fix any of the following:
Form element does not have an implicit (wrapped) <label>
Form element does not have an explicit <label>
aria-label attribute does not exist or is empty
aria-labelledby attribute does not exist, references elements that do not exist or references elements that are empty
Element has no title attribute
Element's default semantics were not overridden with role="none" or role="presentation"
```
&&
```
Validation in the test method [verifyTourFeatures]
Check for [org.xwiki.tour.test.po.StepEditModal] at http://xwikiweb:8080/xwiki/bin/edit/Tour/NewTest/WebHome?form_token=Fq5m5adIcA3TSSLObuoxyQ&template=TourCode.TourTemplate&title=NewTest&parent=Tour.WebHome&editor=inline#.
Found [1] items

1: Select element must have an accessible name
Description: Ensures select element has an accessible name
Help URL: https://dequeuniversity.com/rules/axe/4.8/select-name?application=axeAPI
Help: Select element must have an accessible name
Impact: critical
Tags: cat.forms, wcag2a, wcag412, section508, section508.22.n, TTv5, TT5.c, EN-301-549, EN-9.4.1.2, ACT

HTML element:
<select id="stepOrderSelect">
<option selected="selected" value="0">1</option>
</select>
Selector: stepOrderSelect
Fix any of the following:
Form element does not have an implicit (wrapped) <label>
Form element does not have an explicit <label>
aria-label attribute does not exist or is empty
aria-labelledby attribute does not exist, references elements that do not exist or references elements that are empty
Element has no title attribute
Element's default semantics were not overridden with role="none" or role="presentation"
```