fix(ui2)!: consistent ruler width inside/outside statusline

Problem: before ui2, the ruler in the last line had a one cell safety
margin on the right because writing in the last column of the last line
"scrolls the screen up on some terminals," according to code comments.
When the ruler is included in the statusline, it aligns on the left with
the normal ruler, but goes all the way to the screen edge on the right,
and is therefore one cell longer.

Since ui2 doesn't have that padding cell, they don't align anymore.

Also, in the future, when the C implementation of the ruler will be
replaced with a default expression that will be included in the default
statusline (currently `%-14.(%l,%c%V%) %P`), the width will naturally be
the same in both places, and the unit tests will need adapting anyway.

Solution: when ui2 is active, increase the ruler width by 1.

BREAKING CHANGE: the default ruler in ui2 is now 1 cell wider.

ref https://github.com/neovim/neovim/issues/40247

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