[BUG] Some bugs related to Details view

[JuancaG05]

There are 2 glitches related to the details screen:

1. Incorrect top bar when coming from preview

Actual behaviour

When coming from a preview which is hosted in an activity (currently images and videos previews), the top bar shown is not the one that should be shown.

Expected behaviour

The top bar should show the back arrow and the file title, not the top bar shown in the root folder.

Steps to reproduce

1. Go to an image/video preview
2. Press the 3-dot menu and go to Details
3. See the incorrect top bar

Record_2023-10-11-19-56-15.mp4

(Thanks @parneet-guraya)

2. Repetitive navigation when coming from preview

Actual behaviour

When coming from a preview which is hosted in an activity (currently images and videos previews), if we press back until we are in the root folder and we press back again, we go back to the preview we were seeing once more.

Expected behaviour

When we are in the root folder and press back, we should exit the app.

Steps to reproduce

1. Go to an image/video preview
2. Press the 3-dot menu and go to Details
3. Press back until we are in the root folder
4. Press back again
5. See we are in the preview screen again

This is not a loop, it only happens twice due to the back stack we have (when we are in a preview hosted in an activity and we go to the details screen, FileDisplayActivity is opened again, more details here: #4177 (comment)).

Record_2023-10-15-16-00-23.mp4

(Thanks @parneet-guraya)

Can these problems be reproduced with the official owncloud server?
(url: https://demo.owncloud.org, user: test, password: test)
Yes they can, they are not related to the server but to the app itself.