[LyX/master] Remove unused function

[Jürgen Spitzmüller]

Am Samstag, dem 05.03.2022 um 09:07 +0100 schrieb Kornel Benko:
> As you are at it, we also have identical functions with different
> names.
> See
> 	docstring const & Bullet::getText() const
> and
> 	docstring const & Bullet::getUnicode() const
> 
> Any reason to not unify them?

The functions are not identical. One returns text for source (text),
the other for workarea (unicode, now renamed label).

Jürgen

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