Display the marker comments by default

src/kdenlivesettings.kcfg

@@ -267,7 +267,7 @@
 
     <entry name="showmarkers" type="Bool">
       <label>Display clip markers comments in timeline.</label>
-      <default>false</default>
+      <default>true</default>
     </entry>
 
     <entry name="displayallchannels" type="Bool">