[FIX] web: properly display tooltips with much data

When there is a lot of texts to display in a tooltip, it will overflow
the viewport vertically as the max-width of the tooltip is set at 200px
(bootstrap default). This commit increases the max-width to the
viewport full-width.

opw-725804

addons/web/static/src/less/tooltip.less

@@ -5,6 +5,8 @@
     opacity: 1;
 
     .tooltip-inner {
+        max-width: 300px; // fallback for browsers which do not support "vw" unit
+        max-width: 100vw;
         background-color: @odoo-tooltip-background-color;
         color: @odoo-tooltip-color;
         border-radius: @border-radius-base;