gitweb: make annotate popup use theme colors stable

gitweb: make annotate popup use theme colors

--- a/mercurial/templates/static/style-gitweb.css	Mon Jul 25 12:22:17 2016 +0800
+++ b/mercurial/templates/static/style-gitweb.css	Mon Jul 25 12:33:18 2016 +0800
@@ -59,7 +59,7 @@
   display: none;
   position: absolute;
   background-color: #FFFFFF;
-  border: 1px solid #000000;
+  border: 1px solid #d9d8d1;
   text-align: left;
   color: #000000;
   padding: 5px;

--- a/tests/test-hgweb.t	Mon Jul 25 12:22:17 2016 +0800
+++ b/tests/test-hgweb.t	Mon Jul 25 12:33:18 2016 +0800
@@ -404,7 +404,7 @@
     display: none;
     position: absolute;
     background-color: #FFFFFF;
-    border: 1px solid #000000;
+    border: 1px solid #d9d8d1;
     text-align: left;
     color: #000000;
     padding: 5px;