Remove wxPropertyGrid colours not recognized by wxColour.

Don't use colour names which can't be used to successfully initialize
wxColour.

This is not the best solution, we probably should add these names to the
colour database instead, but for now it's better than getting errors when
trying to use these colours for colour properties in wxPropertyGrid.

See #15597.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@75066 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Use correct contributor name for Jonathan Liu.

Correct the changelog entry added by r73938, see #10625.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@75067 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775