Fix features in thread lists

Due to an update in the HTML structure of thread lists, many features
stopped working properly. This CL fixes these issues.

In the case of the "reduce whitespace" option, the thread list styles
applied in small screens have been temporarily removed since they have
to be fixed still.

Bug: twpowertools:138
Change-Id: Icf6d74f8a579fedb6af65f44864bd6f744098f2a
diff --git a/src/static/css/thread_list_avatars.css b/src/static/css/thread_list_avatars.css
index ff739d8..7427433 100644
--- a/src/static/css/thread_list_avatars.css
+++ b/src/static/css/thread_list_avatars.css
@@ -50,7 +50,10 @@
 
 /*
  * Changing styles of existing elements so the avatars fit.
+ *
+ * NOTE: The first px value is the pixels already removed by the default CSS
+ * styles. The second px value is the value substracted due to the avatars.
  */
-body.TWPT-threadlistavatars-enabled ec-thread-summary .main-header .panel-description a.header .header-content {
-  width: calc(100% - 194px);
+body.TWPT-threadlistavatars-enabled ec-thread-summary .main-header .action .header .header-content {
+  width: calc(100% - 160px - 98px);
 }