install.sh: Fix gnome-shell flavor option

vinceliuice / Matcha-gtk-theme

Matcha is a flat Design theme for GTK 3, GTK 2 and Gnome-Shell

https://www.pling.com/p/1187179/

GNU General Public License v3.0

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Closed susnux closed 3 years ago

susnux commented 3 years ago

When packaging this project for openSUSE I noticed my old PR does not always work as expected. So this fix is more robust.

Sorry for the inconvenience.