Only make desktop files executable

src/freedombone-image-mesh

     echo 'Icon=qtox' >> /home/$MY_USERNAME/Desktop/tox.desktop
     echo 'StartupNotify=true' >> /home/$MY_USERNAME/Desktop/tox.desktop
 
-    chmod +x /home/$MY_USERNAME/Desktop/*
+    chmod +x /home/$MY_USERNAME/Desktop/*.desktop
     chown ${MY_USERNAME}:${MY_USERNAME} /home/$MY_USERNAME/Desktop/*
 }
 
     echo 'Categories=Application;' >> /home/$MY_USERNAME/Desktop/new_identity.desktop
 
     # set permissions
-    chmod +x /home/$MY_USERNAME/Desktop/*
+    chmod +x /home/$MY_USERNAME/Desktop/*.desktop
     chown ${MY_USERNAME}:${MY_USERNAME} /home/$MY_USERNAME/Desktop/*
     chown ${MY_USERNAME}:${MY_USERNAME} /home/$MY_USERNAME/.config
     chown -R ${MY_USERNAME}:${MY_USERNAME} /home/$MY_USERNAME/.config/tox