[pass] Use find instead of tree to search for cmd_find

[Serpent7776]

Hello,

Some time ago I've sent a patch that add switch -1 (number one, not letter ell)
to command ls that lists passwords one per line using find. I attach modified
version that also add switch -1 to search command. Unfortunately it only accept
one term when searching, so

pass search -1 foo

works, but

pass search -1 foo bar

will search only for foo
This could be fixed by using 

find -iregex

and I made it to work on FreeBSD with find -E, but GNU find does not understand
-E option

Anyway hope it will be useful.

-- 
//Serpent7776
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