indicator - How do I set the panel whitelist back to the default?

I set this option:

gsettings set desktop.unity.panel systray-whitelist "['all']"

and now I am having all sorts of weird problems with my panel like double icons and stuff, how do I reset this setting to the default setting?

Try installing the dconf-tools from software center.

Press ALT + F2 to run a command and search for dconf-editor

Highlight the whitelist entry as shown in the picture and click the Set To Default button.

Log-off and login for the change to take effect.