appDisplay: Set minRows to 3 in folder dialog grid

It gives the folder dialog a better layout overall. This is
going to be replaced in the future by the new icon grid code,
but it's a good improvement to have until there.

https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1301

js/ui/appDisplay.js

@@ -1028,7 +1028,7 @@ class FolderView extends BaseAppView {
             x_expand: true,
             y_expand: true,
         }, {
-            minRows: 1,
+            minRows: 3,
         });
 
         // If it not expand, the parent doesn't take into account its preferred_width when allocating