fix #280950: Text style style changes not applied to existing chord symbols #4650
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Fixes https://musescore.org/en/node/280950.
There is no need for Harmony to override TextBase::styleChanged, since TextBase::styleChanged calls setProperty for all the styled properties, and Harmony::setProperty calls render().
Overriding this function without calling TextBase::styleChanged() was the cause of the problem.