printers: Give printer name fewer characters in width
requested to merge ptomato/gnome-control-center:fix-printer-label-width-at-default-window-size into master
At the default window size, the printer name label is too wide and collapses the UI into phone mode. (This is the only panel that shows up in phone mode by default.) Giving the printer name fewer characters avoids this.
Here's a screencast showing the problem:
(I know this screencast was made with a different font than Cantarell, but I also tested it with Cantarell.)