BugFix: Fix wrong coloured Lua debug message

In (bool)TLuaInterpreter::compile(const QString & code, QString & errorMsg)
an OK response was being coloured red rather than the dark green that other
messages in similar methods were using.

Signed-off-by: Stephen Lyons <slysven@virginmedia.com>
Merge pull request #211 from SlySven/fix_luaCompileMessageColour

BugFix: Fix wrong coloured Lua debug message