fix: simplify label grouping condition

Author: mbant

src/components/fx/hover.js

@@ -1756,8 +1756,7 @@ function hoverAvoidOverlaps(hoverLabels, rotateLabels, fullLayout, commonLabelBo
             var p1 = g1[0];
             topOverlap = p0.pos + p0.dp + p0.size - p1.pos - p1.dp + p1.size;
 
-            // Only group points that lie on the same axes
-            if(topOverlap > 0.01 && p0.crossAxKey === p1.crossAxKey) {
+            if(topOverlap > 0.01) {
                 // push the new point(s) added to this group out of the way
                 for(j = g1.length - 1; j >= 0; j--) g1[j].dp += topOverlap;