[4.3] Guided Tours replace deprecated access of input property

[heelc29]

Summary of Changes

Apply changes from #39029 for guided tours

Testing Instructions

• save a tour
• open tour edit form
• open step edit form
• check module (mod_guidedtours)

Actual result BEFORE applying this Pull Request

Use of deprecated access to the application's input property

Expected result AFTER applying this Pull Request

All works like before, but without using deprecated access to the application's input property

Link to documentations

Please select:

• No documentation changes for docs.joomla.org needed
• No documentation changes for manual.joomla.org needed

[joomdonation]

I have tested this item ✅ successfully on 3a45fa7

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[viocassel]

I have tested this item ✅ successfully on 3a45fa7

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[alikon]

RTC

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[obuisard]

Thank you @heelc29 for the PR :-)