Fix light magenta definition in the colour database.

Make it different from magenta itself, otherwise a colour constructed from
"magenta" string was returning "light magenta" as its name.

The exact value of this colour is not well-defined, another commonly used one
seems to be 0xff80ff, but in a lot of places it is used as a synonym for
fuchsia pink which is pretty unambiguously 0xff77ff.

Closes #15628.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_3_0_BRANCH@75112 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/gdicmn.cpp

@@ -333,7 +333,7 @@ void wxColourDatabase::Initialize()
         {wxT("LIGHT GREY"), 192, 192, 192},
         {wxT("LIGHT STEEL BLUE"), 143, 143, 188},
         {wxT("LIME GREEN"), 50, 204, 50},
-        {wxT("LIGHT MAGENTA"), 255, 0, 255},
+        {wxT("LIGHT MAGENTA"), 255, 119, 255},
         {wxT("MAGENTA"), 255, 0, 255},
         {wxT("MAROON"), 142, 35, 107},
         {wxT("MEDIUM AQUAMARINE"), 50, 204, 153},