fix: show dashboard heatmap in full size

* issue introduced by #13623 makes the heatmap to show up really small

Author: wULLSnpAXbWZGYDYyhWTKKspEQoaYxXyhoisqHf

web_src/less/features/heatmap.less

@@ -3,7 +3,6 @@
   text-align: center;
   position: relative;
   min-height: 125px;
-  display: flex;
   align-items: center;
   justify-content: center;