Colors anomalies in terminalrc config file

Noticed anomalies with the cursor and some colors. The OS is fresh anew of few days. I had changed some colors and options using the default "preferences" GUI panel. Noticed anomalies subsequently. After reading the terminal config file for the first time at ~/.config/xfce4/terminal/terminalrc, i noticed that most RGB colors are invalid, a new value get concatenated with the old one, instead of being replaced.

I do advise to create a test to verify that a color is valid, when the config is loaded. It could be confusing for newcomers, as it breaks usability. In particular, it affects the cursor blinking.