Delete custom color map for matrix chart

[Davide Baldini <baldiniebaldini gmail com>]

Hello,

the customization menu for matrix charts (a.k.a. heatmaps) allows the user to 
define custom color schemes or gradients. Once these custom color schemes are 
defined, the GUI doesn't seem to offer a mechanism to delete them, and they 
persist on application closure and on any unrelated spreadsheet subsequently 
opened, i.e. globally.

Specifically, the menu offers the buttons "New", "Duplicate" and "Save" but no 
"Delete".

Screenshot attached for convenience.

This is Gnumeric 1.12.50

-- Davide

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