autocomplete-combobox: trim only leading whitespace
autocomplete-combobox: trim only leading whitespace

For word-wise search to work we need to pass any trailing whitespaces to
the server so that it can determine whether a word has been terminated.

Signed-off-by: Imre Deak <fbd5edba1988036c8923f0cca0cce6ac4811db29@gmail.com>

kansanmuisti/kamu,kansanmuisti/kamu,kansanmuisti/kamu,kansanmuisti/kamu,kansanmuisti/kamu