Fix default stroke width handling in log_line_strip_Xd and log_obbs

[abey79]

What

Fixes:

• log_line_strips_3d with no stroke_widths argument shows no lines #3711

Tested with:

import rerun as rr

rr.init("rerun_example_line_strip3d", spawn=True)

points_3d = [
    [0, 0, 0],
    [0, 0, 1],
    [1, 0, 0],
    [1, 0, 1],
    [1, 1, 0],
    [1, 1, 1],
    [0, 1, 0],
    [0, 1, 1],
]

points_2d = [
    [
        [0, 0],
        [1, 0],
        [1, 1],
        [0, 1],
    ],
    [
        [2, 2],
        [3, 3],
        [3, 4],
        [5, 2],
    ],
]

rr.log_line_strips_3d("strip", [points_3d])
rr.log_line_strips_2d("strip2", points_2d)
rr.log_obbs("obb", positions=[[0, 0, 0], [10, 10, 10]], half_sizes=[[1, 1, 1], [2, 2, 2]])

rr.log_transform3d("with_width", rr.Translation3D([3, 3, 3]))
rr.log_line_strips_3d("with_width/strip", [points_3d], stroke_widths=0.2)
rr.log_line_strips_2d("with_width/strip2", points_2d, stroke_widths=[0.2, 0.3])
rr.log_obbs("with_width/obb", positions=[[0, 0, 0], [10, 10, 10]], half_sizes=[[1, 1, 1], [2, 2, 2]], stroke_widths=[0.2, 0.3])

Checklist

• I have read and agree to Contributor Guide and the Code of Conduct
• I've included a screenshot or gif (if applicable)
• I have tested demo.rerun.io (if applicable)

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