Removing ScanQR Debug Logging

[phutelmyer]

Describe the change
Updated ScanQR logging to remove [DEBUG] statements from outputting on invalid strings.

Before:

strelka_backend_1      | 2022-04-26 12:00:59 - [DEBUG] PIL.PngImagePlugin [PngImagePlugin.call]: STREAM b'pHYs' 41 9
strelka_backend_1      | 2022-04-26 12:00:59 - [DEBUG] PIL.PngImagePlugin [PngImagePlugin.call]: STREAM b'IDAT' 62 2975
strelka_backend_1      | 2022-04-26 12:00:59 - [DEBUG] PIL.PngImagePlugin [PngImagePlugin.call]: STREAM b'IHDR' 16 13
strelka_backend_1      | 2022-04-26 12:00:59 - [DEBUG] PIL.PngImagePlugin [PngImagePlugin.call]: STREAM b'pHYs' 41 9
strelka_backend_1      | 2022-04-26 12:00:59 - [DEBUG] PIL.PngImagePlugin [PngImagePlugin.call]: STREAM b'IDAT' 62 20871

After:
No [DEBUG] statements expected

Describe testing procedures
Built PR and tested against various files that reported [DEBUG] statements.

Sample output
N/A

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of and tested my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings