fix(selected-list): remove redundant (and w/ invalid html) label

[rjherrera]

Motivation / Background

The same as #506 but for v1, thanks @quadule for the PR and @tobischo for reporting the issue.

Detail

Basically removes a redundant line intended for creating the label for the input.

The line had 2 issues:

1. The label was already created in a "parent" method (here).
2. The content_tag method was called incorrectly, with the whole label as argument instead of the tag type as first argument and options as second. It was generating invalid HTML, eg. <_label_for__X__class__label__Y__label_></_label_for__X__class__label__Y__label_> which was completely malformed.

Checklist

Before submitting the PR make sure the following are checked:

• This Pull Request is related to one change. Changes that are unrelated should be opened in separate PRs.
• Commit message has a concise description of what changed and why.
• Tests are added or updated if you fix a bug or add a feature.
• Documentation has been added or updated if you add a feature or modify an existing one.
• CHANGELOG files are updated for the changed libraries if there is a behavior change or additional feature (under the "Unreleased" heading if this is not a version change).
• My changes don't introduce any linter rule violations.