[fix] simple theme: remove width 45% from language and time filters

All three filters (`language`, `time_range` and `safesearch`) are rendered in
one line.  A size of 45% for `language` and `time_range` left only 10% for the
`safesearch` filter.  Solution: drop with from `language` and `time_range`.

Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>