Remove superfluous declaration of `$date`
Remove superfluous declaration of `$date`

The null check is already part of the `$this->date()` function and `$date` is never used.

firefly-iii/firefly-iii,JC5/firefly-iii,firefly-iii/firefly-iii,firefly-iii/firefly-iii,JC5/firefly-iii,firefly-iii/firefly-iii