[Post-NUX] Merge "Debug Mode" and "Enable Logging"

[faisal-alvi]

Describe the bug

As discussed in #105 (comment):

These two settings are independent of each other and have different functionalities:

Debug Mode: Toggles logging Square payment gateway errors on/off
Enable Logging: Toggles logging Square connection, import & sync errors on/off

Given this, merchants can have "Enable Logging" turned off and have Debug mode set to "Save to log" and errors from the checkout will still be logged.

So we have internally decided to merge these settings together rather than keeping them separate as they seem to do more or less the same thing and we'll do that in a separate PR.

To reproduce

n/a

Screenshots

added above

Expected behavior

Both settings should be merged, their current usage should also be altered after the merge.