Remove ambiguous interactive check

[m-mohr]

Enables using device code in Jupyter environments (through IRKernel).

[m-mohr]

The is_interactive() in the if is always true and not required if interactive = TRUE is present in the oauth_flow_check. Unfortunately, IRKernel for Jupyter is declared as non-interactive and as such the device code can't be used there. Would be nice if we could enable it for Jupyter envs, too.
Seems we won't get it through IRKernel (see IRkernel/IRkernel#236), the issue is 7 years old. As such trying to get it working anyway.

[m-mohr]

Workaround for us is now: rlang::with_interactive(oauth_flow_device(...))