Fix attribute error

[klaasnicolaas]

This pull request solves the problem with the attribute error that occurs when you want to run the code.

Traceback (most recent call last):
  File "run_app.py", line 67, in <module>
  File "run_app.py", line 36, in __init__
  File "src\gui\main_gui.py", line 80, in __init__
  File "src\gui\pages\page_select_camera.py", line 57, in __init__
  File "tkinter\__init__.py", line 564, in __init__
  File "tkinter\__init__.py", line 372, in __init__
AttributeError: 'int' object has no attribute '_root'

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[willwade]

Yep - we found this too - in our #31 likewise

[klaasnicolaas]

let's just hope it gets merged soon 😉

[klaasnicolaas]

closing it, because fixed in other PR