Previously, on machines where the logged-in user count is 1, the `sed`
expression to filter out "... X users, ..." doesn't filter out "... X
user, ...", leading to something like
```
1h 05, 1 user, load average: 0.05, 0.72, 1.62m
```
being displayed in the module. When the user count is greater than 1
(e.g., after `ssh localhost`), the `uptime` module displays
```
1h 05m
```
as expected.
The Stack Overflow answer the `sed` expression is based on [^1][^2]
doesn't seem to consider the case when the user count is 1.
With this patch, the `uptime` module display correctly when the user
count is 1.
[^1]: https://stackoverflow.com/a/28353785
[^2]: https://github.com/catppuccin/tmux/pull/163
