removed string message wind_display ("dd") which was unused

Change-Id: I57c9915340b11de9aaac56c616c875d97e5c14d9

mobile/com.sap.sailing.racecommittee.app/res/values-de/strings.xml

@@ -266,7 +266,6 @@
     <string name="race_started">Gestartet %s</string>
     <string name="race_finished">Beendet %s</string>
     <string name="wind">Wind</string>
-    <string name="wind_display">dd</string>
     <string name="flags_abandon">Abbrechen</string>
     <string name="flags_recall">Rückruf</string>
     <string name="flags_course">Kurs</string>

mobile/com.sap.sailing.racecommittee.app/res/values/strings.xml

@@ -307,7 +307,6 @@
     <string name="login_sub_text">Please select a regatta</string>
     <string name="login_onboarding_text">Onboarding</string>
     <string name="sign_up">Sign Me Up</string>
-    <string name="wind_display">dd</string>
     <string name="flags_abandon">Abandon</string>
     <string name="flags_recall">Recall</string>
     <string name="flags_course">Course</string>