Bug: Line numbers above 9999 are wrapping improperly

[import-pandas-as-numpy]

Issue: Line numbers past 9999 wrap in their column element.

https://inspector.pypi.io/project/rp/0.1.914/packages/07/67/ceeb07d5b8165c270e729f6fb950061b7afea5283ecb546b6e1bed915ea8/rp-0.1.914.tar.gz/rp-0.1.914/rp/r.py#line.10250

This was missed behavior in the line wrapping change (#146). I'm aware of this, bringing it to your attention while I stumble my way through a fix here locally. Line linking still behaves correctly, just looks a bit strange graphically.