tv_grab_sd_json: max number of lineups

"
This step configures the lineups enabled for your Schedules Direct
account. It impacts all other configurations and programs using the
JSON API with your account. A maximum of 4 lineups can by added to
your account. In a later step you will choose which lineups or
channels to actually use for this configuration.
"

That's not true (4 lineups). The JSON service has a soft limit of 4,
but can be increased if necessary.

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