[FIX] web: fix the display issue with kanban examples wizard

Before this commit, when we go to the project.task > kanban examples wizard:
small display issue if we zoom in the wizard until we see the scroll bar,
then the left border of the menu disappears.

The commit solve the issue by adding a property height : fit-content that
will adjust content according to the height.

task-2720976

X-original-commit: cabf5bef9c1f0470c171e9f375bb29fc749ad8fa
Part-of: odoo/odoo#90897

addons/web/static/src/legacy/scss/kanban_examples_dialog.scss

@@ -9,6 +9,7 @@
         flex: 0 0 auto;
         border-right: 1px solid gray('300');
         background: white;
+        height: fit-content;
 
         > ul > li {
             margin: 0;