Thread list avatars: order avatars in the natural direction

For left-to-right users, avatars were shown from right to left (and for
RTL users they were shown LTR). In order to improve clarity, now they
will be ordered in the natural direction, which means people who have
replied first will be shown first instead of last.

Thanks Ari for the feedback which led to this change!

Change-Id: Ia634cac85234a91481f2d27902830afdb2b433df
diff --git a/src/static/css/thread_list_avatars.css b/src/static/css/thread_list_avatars.css
index a418005..9983733 100644
--- a/src/static/css/thread_list_avatars.css
+++ b/src/static/css/thread_list_avatars.css
@@ -1,9 +1,9 @@
 .TWPT-avatars {
   display: flex;
-  flex-direction: row-reverse;
-  width: 102px;
+  flex-direction: row;
+  min-width: 108px;
   overflow-x: hidden;
-  margin-left: 8px;
+  margin-left: 14px;
 .TWPT-avatars .TWPT-avatar {
@@ -23,5 +23,5 @@
  * Changing styles of existing elements so the avatars fit.
 ec-thread-summary .main-header .panel-description a.header .header-content {
-  width: calc(100% - 204px);
+  width: calc(100% - 218px);