[FIX] web: Kanban height with few element and searchpanel

Before this commit:
When there few elements in kanban and a search panel, all kanban
cards try to take a maximum of height and become deformed.

After this commit:
The behaviour of dimensions of kanban cards must be the same with
or without searchpanel.

closes #38556

closes odoo/odoo#38871

X-original-commit: a95cbbd631a2fa9be62eb42cba43e853fdf4b789
Signed-off-by: jbm-odoo <jbm-odoo@users.noreply.github.com>

addons/web/static/src/scss/search_panel.scss

@@ -14,7 +14,7 @@ $o-searchpanel-filter-default-color: #D59244;
     .o_renderer_with_searchpanel {
         flex: 1 1 100%;
         overflow: auto; // make the renderer and search panel scroll individually
-        height: 100%;
+        max-height: 100%;
     }
     .o_search_panel {
         flex: 0 0 220px;