Rename to GNOME LaTeX: AppData: provide binary name

To be able to search "gnome-latex".

data/org.gnome.gnome-latex.appdata.xml.in

@@ -54,6 +54,7 @@
     <id>evince.desktop</id>
   </suggests>
   <provides>
+    <binary>gnome-latex</binary>
     <id>org.gnome.latexila.desktop</id>
   </provides>
   <url type="homepage">https://wiki.gnome.org/Apps/LaTeXila</url>