gplugin/gplugin

Use g_set_str everywhere
default tip
4 days ago, Elliott Sales de Andrade
ed6abba21225
Use g_set_str everywhere

This simplifies some setters.

Testing Done:
Ran `ninja turtles`

Reviewed at https://reviews.imfreedom.org/r/3179/
<?xml version="1.0" encoding="UTF-8"?>
<gresources>
<gresource prefix="/org/imfreedom/keep/gplugin/gplugin/viewer/">
<file compressed="true" preprocess="xml-stripblanks">window.ui</file>
</gresource>
</gresources>