Relocate "Printables" button and/or change its style

[Tupson444]

Currently (2.9.0), Printables button is the same style and right next to Plater, Print Settings, Filaments and Printers, while not being related to the other tabs. It is too easy to accidentally click on the Printables instead of Printers (especially because the words are similar).

Please can it simply be adequately distinguished from the other tabs? Either relocate it or change its style (or both).

This issue is related to #13635, which asked to add a toggle for Printables tab. That issue is closed because "not everything should be customizable", so here I propose an alternative.