[LyX/master] Fix Qt deprecation warns for setTextColor()

[Jürgen Spitzmüller]

Am Donnerstag, den 19.03.2020, 15:11 +0100 schrieb Scott Kostyshak:
> commit 8583410617c756e072ee997f918395d6f29b8246
> Author: Scott Kostyshak <skostysh at lyx.org>
> Date:   Thu Mar 19 10:16:19 2020 -0400
> 
>     Fix Qt deprecation warns for setTextColor()
>     
>     This commit fixes the following warning from Qt 5.14:

Thanks for this initiative, Scott.

It's a pleasure to see these annoying warnings disappear by and by.

Jürgen
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