[FIX] web_tour: better point at the anchor element

Before this commit, tips were bouncing from 6px from the anchor to 0px
from the anchor. Now they bounce from 3px from the anchor to 3px
inside the anchor.

closes odoo/odoo#61846

Signed-off-by: Quentin Smetz (qsm) <qsm@odoo.com>

addons/web_tour/static/src/scss/tip.scss

 $o-tip-width: 28px;
 $o-tip-height: 38px;
-$o-tip-anchor-space: 3px;
+$o-tip-anchor-space: 0;
+$o-tip-bounce-half-size: 3px;
 $o-tip-color: $o-enterprise-color;
 $o-tip-border-width: 3px;
 $o-tip-border-color: white;
@@ -13,18 +14,18 @@ $o-tip-size-delay-in: $o-tip-duration-in - $o-tip-size-duration-in;
 
 @keyframes move-left-right {
     0% {
-        transform: translate(-$o-tip-anchor-space, 0);
+        transform: translate(-$o-tip-bounce-half-size, 0);
     }
     100% {
-        transform: translate($o-tip-anchor-space, 0);
+        transform: translate($o-tip-bounce-half-size, 0);
     }
 }
 @keyframes move-bottom-top {
     0% {
-        transform: translate(0, -$o-tip-anchor-space);
+        transform: translate(0, -$o-tip-bounce-half-size);
     }
     100% {
-        transform: translate(0, $o-tip-anchor-space);
+        transform: translate(0, $o-tip-bounce-half-size);
     }
 }