newaccountsettingsview: update string for rendezvous setting

The rendezvous feature is no longer experimental.  Update the string
for the setting to match that of jami-qt.

Change-Id: Ib46ae292e2425a8f34a570cd7df9289b809d98f7
GitLab: #1217

ui/newaccountsettingsview.ui

@@ -1261,7 +1261,7 @@
                                           <property name="margin_right">12</property>
                                           <property name="visible">True</property>
                                           <property name="can_focus">False</property>
-                                          <property name="label" translatable="yes">(Experimental) Rendez-vous: turn your account into a conference room</property>
+                                          <property name="label" translatable="yes">Convert your account into a rendezvous point</property>
                                         </object>
                                       </child>
                                       <child>