Add fuser to allowed PATH tools

fuser is used by goma

Test: none
Change-Id: I9acf4dd062c3b767a1688e4f236a96d5f2b8a7f6
diff --git a/ui/build/paths/config.go b/ui/build/paths/config.go
index aeefcf2..51fa8fe 100644
--- a/ui/build/paths/config.go
+++ b/ui/build/paths/config.go
@@ -77,6 +77,7 @@
 	"env":       Allowed,
 	"expr":      Allowed,
 	"find":      Allowed,
+	"fuser":     Allowed,
 	"getconf":   Allowed,
 	"getopt":    Allowed,
 	"git":       Allowed,