selectAll -> select because it can only be one node

Author: alexcjohnson

src/components/legend/draw.js

@@ -575,7 +575,7 @@ function computeTextDimensions(g, gd) {
         Drawing.setTranslate(mathjaxGroup, 0, (height / 4));
     }
     else {
-        var text = g.selectAll('.legendtext');
+        var text = g.select('.legendtext');
         var textLines = svgTextUtils.lineCount(text);
         var textNode = text.node();