`__repr__` method shows duplicated rows

[LTLA]

import biocframe
x=biocframe.BiocFrame({"A": [1,2,3]})
x
## BiocFrame with 3 rows & 1 columns 
## contains row names?: False 
## +---+
## | A |
## +---+
## | 1 |
## | 2 |
## | 2 |
## | 3 |
## +---+

Also, why not actually show the row names? Just slap them on the left of the table or something. Then you wouldn't need the line at the top; if there's no row names, just don't show them.