starmath: Separate color name and operand by space

Otherwise, errors happen at MathML import.

Change-Id: I17037b430710ea4d26340e7ce13c7972a76f614f
diff --git a/starmath/source/node.cxx b/starmath/source/node.cxx
index 3904133..ca21a7e 100644
--- a/starmath/source/node.cxx
+++ b/starmath/source/node.cxx
@@ -1780,34 +1780,34 @@ void SmFontNode::CreateTextFromNode(OUString &rText)
            rText += "color yellow ";
            break;
        case TTEAL:
            rText += "color teal";
            rText += "color teal ";
            break;
        case TSILVER:
            rText += "color silver";
            rText += "color silver ";
            break;
        case TGRAY:
            rText += "color gray";
            rText += "color gray ";
            break;
        case TMAROON:
            rText += "color maroon";
            rText += "color maroon ";
            break;
        case TPURPLE:
            rText += "color purple";
            rText += "color purple ";
            break;
        case TLIME:
            rText += "color lime";
            rText += "color lime ";
            break;
        case TOLIVE:
            rText += "color olive";
            rText += "color olive ";
            break;
        case TNAVY:
            rText += "color navy";
            rText += "color navy ";
            break;
        case TAQUA:
            rText += "color aqua";
            rText += "color aqua ";
            break;
        case TFUCHSIA:
            rText += "color fuchsia";
            rText += "color fuchsia ";
            break;
        case TSANS:
            rText += "font sans ";