add outside ticks to multicategory2 mock

... to show divider span bug, update baseline using 1.49.4

Author: etpinard

src/plots/cartesian/axes.js

@@ -1799,6 +1799,8 @@ axes.drawOne = function(gd, ax, opts) {
         var pad = {x: 2, y: 10}[axLetter];
         var sgn = tickSigns[2] * (ax.ticks === 'inside' ? -1 : 1);
 
+        // TODO missing 'ax.ticklen` part when tickson:'labels'
+
         seq.push(function() {
             labelLength += getLabelLevelSpan(ax, axId + 'tick') + pad;
             labelLength += ax._tickAngles[axId + 'tick'] ? ax.tickfont.size * LINE_SPACING : 0;

test/image/baselines/multicategory2.png

@@ -25,10 +25,12 @@
   ],
   "layout": {
     "xaxis": {
-      "title": "MULTI-CATEGORY ON TOP",
+      "title": {"text": "MULTI-CATEGORY ON TOP"},
       "side": "top",
-      "automargin": true,
-      "tickson": "labels"
+      "tickson": "labels",
+      "ticks": "outside",
+      "ticklen": 25,
+      "automargin": true
     },
     "showlegend": false,
     "width": 400,