window-list: Drop height override

gnome-shell's top bar got taller, and is now just 1px smaller than
our size override. We don't need that additional pixel to fit our
UI, so remove the override to make the sizes of both bars consistent.

https://gitlab.gnome.org/GNOME/gnome-shell-extensions/-/issues/271

Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell-extensions/-/merge_requests/154>

extensions/window-list/stylesheet.css

@@ -1,10 +1,3 @@
-.bottom-panel {
-  /* .window-button-icon height +
-     .window-button vertical padding +
-     .window-button > StWidget vertical padding) */
-  height: 2.25em;
-}
-
 .window-list {
   spacing: 2px;
   font-size: 10pt;