Fixed discovery server name in UI

Signed-off-by: Marco Marchitto <marco.marchitto@iit.it>

Author: MMarcus95

plugins/datastreamer_plugin/ui/topic_selection_dialog/dialogselecttopics.ui

@@ -340,7 +340,7 @@
            <item>
             <widget class="QLabel" name="label_10">
              <property name="text">
-              <string>Use Server Discovery </string>
+              <string>Use Discovery Server </string>
              </property>
             </widget>
            </item>