[FS#328] Add in "region fix" for TP-Link routers (esp. Archer C7) to fix 18005 error

[LEDE Bugs]

The following task is now closed:

FS#328 - Add in "region fix" for TP-Link routers (esp. Archer C7) to fix 18005 error
User who did this - Matthias Schiffer (NeoRaider)

Reason for closing: Works for me
More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=328