[9.x] Fixes unable to use trans()->has() on JSON language files

[crynobone]

Using trans()->has() on JSON file is not 100% reliable when the $key and $replacement is the same value.

e.g:

{
    "30 Days": "30 Days"
}

// Before
trans()->has('30 Days') // return false

// After
trans()->has('30 Days') // return true