Fix the unwanted line on non-host room

[acarcher]

References #55, I changed the class of the div from "card" to "row d-flex justify-content-center"

[Rmiller1673]

The code you added takes away the line for the non-host room page, however for the host of the room the the new div causes the host room "Up Next" column to be disrupted in size. Please find below a screenshot of the host room page with the disrupted "Up Next" length for header of the column:

[acarcher]

Thanks for pointing that out; the updated PR should reflect a correct change to the the_room.handlebars