Make ui.cursor.primary bg override ui.virtual.ruler bg so the cursor doesn't "disappear"

[qtfkwk]

~/.config/helix/runtime/themes/mine.toml:

inherits = "onedarker"

"ui.cursor.primary" = { fg = "#ffffff", bg = "#ff00ff" }

~/.config/helix/config.toml:

theme = "mine"

[editor]
# ...
rulers = [81, 101]
# ...

You see the cursor on column 80:

The cursor "disappears" on column 81:

Unsure if this is a theme issue or something else. Different themes react differently, but setting a custom cursor color is consistently overridden instead of overriding.

[the-mikedavis]

Duplicate of #7371

[qtfkwk]

also similar/related to #5675