Fix tooltip cutoff (#2936)

We introduced a tooltip for search in #2758
This works fine with the default settings (displaying the "New" button),
however, if you have disabled "New" routes the tooltip is nearer the right
edge of the screen and the tooltip is cutoff.

We fix this by aligning the tooltip to the right, such that even if there
is no "New" button the full tooltip is still displayed.

Author: jaredlt

app/assets/builds/administrate/application.css

@@ -74,12 +74,12 @@ $search-icon-size: 1rem;
 
 /* stylelint-disable property-no-unknown */
 .search__tooltip-popover-positioning {
-  left: anchor(center);
+  left: anchor(right);
   margin: 1rem;
   position: fixed;
   position-anchor: --tooltip-anchor;
   top: anchor(bottom);
-  transform: translateX(-50%);
+  transform: translateX(-100%);
 }
 
 .search__tooltip-popover-value {