`pl.Duration` repr shows `0` for non-zero values

[cmdlineluser]

Polars version checks

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Issue description

non-zero pl.Duration values display as 0 which seems wrong?

Thank you.

Reproducible example

import polars as pl

s = pl.Series(range(6), dtype=pl.Duration)
print(s)
"""
shape: (6,)
Series: '' [duration[μs]]
[
	0µs
	0µs
	0µs
	0µs
	0µs
	0µs
]
"""

print(*s, sep="\n")
"""
0:00:00
0:00:00.000001
0:00:00.000002
0:00:00.000003
0:00:00.000004
0:00:00.000005
"""

Expected behavior

[
	0µs
	1µs
	2µs
	3µs
	4µs
	5µs
]

Installed versions

---Version info---
Polars: 0.15.6
Index type: UInt32
Python: 3.10.8 (main, Nov 25 2022, 12:57:22)