Colour form option not saving properly (Bug #1305275)

The 'customise' optional checkbox was breaking the saving of colours
for boxes without optional setting. This is due to the 'transparent'
being the default and the colour the optional choice.

Altered it so the colour is the default and choosing 'transparent' is
the optional choice for backwards compatibility.

Change-Id: I76e4f2f9557f3f3b8d3baf13cd35ac95d05618f2
Signed-off-by: Robert Lyon <robertl@catalyst.net.nz>
Merge "Colour form option not saving properly (Bug #1305275)" into 1.9_STABLE