MDL-67277 forum: Do not display discussion topics in bold

The topics are now inside a table header cell, which shows them in bold
by default.

theme/boost/scss/moodle/modules.scss

@@ -97,6 +97,13 @@ select {
         }
     }
 
+    .discussion-list {
+        .topic {
+            // Do not use the default bold style for the table headings.
+            font-weight: inherit;
+        }
+    }
+
     // Style for the forum subscription mode node.
     .subscriptionmode {
         color: $body-color;

theme/boost/style/moodle.css

@@ -16262,6 +16262,9 @@ select {
 .path-mod-forum .forumheaderlist .discussion .lastpost {
   vertical-align: top; }
 
+.path-mod-forum .discussion-list .topic {
+  font-weight: inherit; }
+
 .path-mod-forum .subscriptionmode {
   color: #373a3c; }
 

theme/classic/style/moodle.css

@@ -16531,6 +16531,9 @@ select {
 .path-mod-forum .forumheaderlist .discussion .lastpost {
   vertical-align: top; }
 
+.path-mod-forum .discussion-list .topic {
+  font-weight: inherit; }
+
 .path-mod-forum .subscriptionmode {
   color: #373a3c; }