libusbmuxd: wait longer in test before checking connection

Author: alebcay

Formula/lib/libusbmuxd.rb

@@ -39,7 +39,7 @@ def install
       exec bin/"iproxy", "-s", "localhost", "#{source}:#{dest}"
     end
 
-    sleep(2)
+    sleep 5
     system "nc", "-z", "localhost", source
   end
 end