canvas and textAlign: middle not recognized, I made one change to original patch to not include the default value in LABEL_ALIGN since I did not see the purpose of adding that, p=fredj, r=me (closes #2439)

git-svn-id: http://svn.openlayers.org/trunk/openlayers@10113 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Renderer/Canvas.js

@@ -371,7 +371,7 @@ OpenLayers.Renderer.Canvas = OpenLayers.Class(OpenLayers.Renderer, {
             // HTML5
             var labelAlign =
                 OpenLayers.Renderer.Canvas.LABEL_ALIGN[style.labelAlign[0]] ||
-                "middle";
+                "center";
             this.canvas.font = fontStyle;
             this.canvas.textAlign = labelAlign;
             this.canvas.fillText(style.label, pt[0], pt[1]);