sidebar-row: Use pre-defined CSS classes instead of a custom one

Author: melix99

data/resources/style.css

@@ -80,11 +80,6 @@
   padding: 6px 0;
 }
 
-.chat-list row .timestamp {
-  font-size: smaller;
-  font-feature-settings: "tnum";
-}
-
 .chat-list row minithumbnail {
   border-radius: 3px;
 }

data/resources/ui/sidebar-row.ui

@@ -50,7 +50,8 @@
                     <property name="single-line-mode">True</property>
                     <style>
                       <class name="dim-label"/>
-                      <class name="timestamp"/>
+                      <class name="numeric"/>
+                      <class name="caption"/>
                     </style>
                   </object>
                 </child>