Diablo: disable autocap/predictive text for the other_browser_cmd entry

The Fremantle UI introduced in commit 18bad5e9... ("Revise GUI for
Fremantle to be more finger-friendly") disables autocapitalization and
predictive text/dictionary features for the other_browser_cmd entry --
those input method features are for natural language text only, and get
in the way here.  Now do the same for the Diablo UI (and make a style
cleanup along the way).