Back & Forward buttons on a keyboard do not work
## Version information
Mint Xfce 20.3, Mint Xfce 22(.0) beta
Thunar version 4.16.8 and 4.18.8
## Steps to reproduce
1. Get a keyboard with forward and back buttons
2. Open Thunar and navigate through various folders, e.g. `/home` > `/home/mint/ > `/home/mint/downloads/`
3. Press the back button on the keyboard
4. Observe how nothing happens
5. Press the back button in Thunar itself at least once
6. Press the forward button on the keyboard
7. Observe how nothing happens
## Current behavior
Back and forward buttons on a keyboard do nothing
## Expected outcome
Back and forward buttons on a keyboard should behave exactly like back and forward buttons on a mouse.
## Additional information
It behaves correctly in Nemo since at least version 5.2.4 in the very same Mint Xfce 20.3, let alone the newest Nemo version of 6.2.1 in Mint Cinnamon 22(.0) beta.
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