Fix minor spelling mistake in RedPhone Constant

Closes #4235
//FREEBIE

src/org/thoughtcrime/redphone/RedPhoneService.java

@@ -80,7 +80,7 @@ public class RedPhoneService extends Service implements CallStateListener, CallS
   public static final String ACTION_INCOMING_CALL = "org.thoughtcrime.redphone.RedPhoneService.INCOMING_CALL";
   public static final String ACTION_OUTGOING_CALL = "org.thoughtcrime.redphone.RedPhoneService.OUTGOING_CALL";
   public static final String ACTION_ANSWER_CALL   = "org.thoughtcrime.redphone.RedPhoneService.ANSWER_CALL";
-  public static final String ACTION_DENY_CALL     = "org.thoughtcrime.redphone.RedPhoneService.DENYU_CALL";
+  public static final String ACTION_DENY_CALL     = "org.thoughtcrime.redphone.RedPhoneService.DENY_CALL";
   public static final String ACTION_HANGUP_CALL   = "org.thoughtcrime.redphone.RedPhoneService.HANGUP";
   public static final String ACTION_SET_MUTE      = "org.thoughtcrime.redphone.RedPhoneService.SET_MUTE";