Switch to toybox find for darwin and linux.

Test: treehugger
Change-Id: Id311b403f50a76e75ed92c2a9e7cc7aa025f2448
diff --git a/ui/build/paths/config.go b/ui/build/paths/config.go
index 738ef40..38e80e0 100644
--- a/ui/build/paths/config.go
+++ b/ui/build/paths/config.go
@@ -80,7 +80,6 @@
 	"diff":     Allowed,
 	"dlv":      Allowed,
 	"expr":     Allowed,
-	"find":     Allowed,
 	"fuser":    Allowed,
 	"getopt":   Allowed,
 	"git":      Allowed,