Switch to toybox mv(1).

Test: treehugger
Change-Id: If4e53cc8d088c7b79399ae8e10601c9b22bd118d
diff --git a/ui/build/paths/config.go b/ui/build/paths/config.go
index e8e92e6..1d8684b 100644
--- a/ui/build/paths/config.go
+++ b/ui/build/paths/config.go
@@ -97,7 +97,6 @@
 	"lsof":      Allowed,
 	"m4":        Allowed,
 	"md5sum":    Allowed,
-	"mv":        Allowed,
 	"openssl":   Allowed,
 	"patch":     Allowed,
 	"pgrep":     Allowed,
@@ -157,6 +156,7 @@
 	"ls":       Toybox,
 	"mkdir":    Toybox,
 	"mktemp":   Toybox,
+	"mv":       Toybox,
 	"od":       Toybox,
 	"paste":    Toybox,
 	"pwd":      Toybox,