Avoid use of front (selfie) camera

[Fleuv]

Describe the issue

Currently when I open the scan function in the Irma App on my Oppo Reno smartphone. The front camera also pops out. Where as with other scanner apps like the one of ING app, this doesn't happen. The rear camera is the only camera being used.

Presumably I therefor make the conclusion that the IRMA app activates both camera's for the scanner app, however it only uses one.

Test case

Steps to reproduce

1. Launch the IRMA app.
2. Enter your pin.
3. Press the button "Scan QR Code".

Expected result

Only the rear camera is activated and all visual input is received.

Actual result

On my phone the front camera slides out/pops up and thus seems to be activated, as well as the rear camera. However the rear camera seems to stream its visual input to the app. The front camera doesn't seem to share any input with the app.