[rubygems/rubygems] Fix another strange error when running `bundle add` in frozen mode

If there's a lockfile, but it's out of sync with the Gemfile because a
dependency has been deleted, and frozen mode is set, Bundler will print
the following strange error:

```
$ bundle add rake
, but the lockfile can't be updated because frozen mode is set

You have deleted from the Gemfile:
* rake (~> 13.2)

Run `bundle install` elsewhere and add the updated Gemfile to version control.
```

This commit changes the error to:

```
Some dependencies were deleted from your gemfile, but the lockfile can't be updated because frozen mode is set

You have deleted from the Gemfile:
* rake (~> 13.2)

Run `bundle install` elsewhere and add the updated Gemfile to version control.
```

https://github.com/rubygems/rubygems/commit/452da4048d

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