Missing back buttons to the Report problem screens on mobile (🅼3)

[schlos]

Describe the bug

Add missing back buttons to the Report problem flow.

Known bug, feedback from Silvija with PR 93:

Back gumb na prijavi problema ne radi pa sam ga privremeno uklonila, ne znam postoji li u base kodu verzije koju imamo jer ga nisam mogla naći

To Reproduce
Steps to reproduce the behavior:

1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See error

Expected behavior

Screenshots

Expected: Comparison back button behaviour in 'fixmystreet' cobrand (master branch, new sw, with multistep):

Comparison back button behavior in 'tlf' cobrand (v3.1, same as our develop branch) - has back button on some screens:

Back link is actually same as go back and edit problem:

Desktop (please complete the following information):

• OS: [e.g. Windows]
• Browser [e.g. chrome, safari]
• Version [e.g. 22]

Smartphone (please complete the following information):

• Device: [e.g. iPhone6]
• OS: [e.g. iOS8.1]
• Browser [e.g. stock browser, safari]
• Version [e.g. 22]

Additional context

Back functionality in base cobrand:
https://gist.github.com/schlos/d1d3bd175dcee17a94ee5dd04726a716#file-fms-base-report-new-fill_in_details-html-L45

[schlos]

Partially fixed with the latest PR:

• Back button is added to the final (3rd) step/screen in Report a problem flow:

• Back button is missing in the 1st and 2nd steps:

[schlos]

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