KUrlNavigator: remove kurisearchfilter usage
Using the kshorturifilter is useful to fix up e.g.: ftp.kde.org --> ftp://ftp.kde.org //some-samba-share --> smb://some-samba-share
However kurisearchfilter, which is used for invoking e.g. an online search, gg blahBleh, would open a web browser and search for blahBleh using google; that doesn't seem to make sense in a file widget.
See discussion at: !248 (comment 150726)
Relevant unit tests still pass.