[FS#843] Switch port order reversed on TL-WR740N (v2.5)

[LEDE Bugs]

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FS#843 - Switch port order reversed on TL-WR740N (v2.5)
User who did this: Piotr Dymacz (pepe2k)
Status: Assigned -> Waiting on reporter

More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=843