only rotate nav-bar by 89.9deg when hiding it

Rotating by full 90deg makes panels anchored to some node, such as
star-button panel, unable to open. Fixes #424

chrome/autohide_bookmarks_and_main_toolbars.css

@@ -32,7 +32,7 @@ See the above repository for updates as well as full license text. */
   background-position: top,var(--lwt-background-alignment);
   background-position-y: calc(0px - var(--tab-min-height) - 2*var(--tab-block-margin,0px));
   background-repeat: repeat,var(--lwt-background-tiling);
-  transform: rotateX(90deg);
+  transform: rotateX(89.9deg);
   transform-origin: top;
   transition: transform 135ms linear var(--uc-autohide-toolbar-delay) !important;
   z-index: 2;

chrome/show_navbar_on_focus_only.css

@@ -11,7 +11,7 @@ See the above repository for updates as well as full license text. */
 
 #urlbar-container{ margin-top: 1px }
 :root[sessionrestored] #nav-bar:not([customizing]){
-  transform: rotateX(90deg);
+  transform: rotateX(89.9deg);
   transition: transform 67ms linear, opacity 0ms linear 67ms !important;
   opacity: 0;
   z-index: 3;