Android User bridge methods should resolve

* A few methods were missing the `replySuccess` to resolve the call from the app developer.

Author: nan-li

android/src/main/java/com/onesignal/flutter/OneSignalUser.java

@@ -58,13 +58,15 @@ private void setLanguage(MethodCall call, Result result) {
             language = null;
         }
         OneSignal.getUser().setLanguage(language);
+        replySuccess(result, null);
     }
 
     private void addAliases(MethodCall call, Result result) {
         // call.arguments is being casted to a Map<String, Object> so a try-catch with
         //  a ClassCastException will be thrown
         try {
             OneSignal.getUser().addAliases((Map<String, String>) call.arguments);
+            replySuccess(result, null);
         } catch(ClassCastException e) {
             replyError(result, "OneSignal", "addAliases failed with error: " + e.getMessage() + "\n" + e.getStackTrace(), null);
         }
@@ -75,6 +77,7 @@ private void removeAliases(MethodCall call, Result result) {
         //  a ClassCastException will be thrown
         try {
             OneSignal.getUser().removeAliases((List<String>) call.arguments);
+            replySuccess(result, null);
         } catch(ClassCastException e) {
             replyError(result, "OneSignal", "removeAliases failed with error: " + e.getMessage() + "\n" + e.getStackTrace(), null);
         }
@@ -105,6 +108,7 @@ private void addTags(MethodCall call, Result result) {
         //  a ClassCastException will be thrown
         try {
             OneSignal.getUser().addTags((Map<String, String>) call.arguments);
+            replySuccess(result, null);
         } catch(ClassCastException e) {
             replyError(result, "OneSignal", "addTags failed with error: " + e.getMessage() + "\n" + e.getStackTrace(), null);
         }
@@ -115,6 +119,7 @@ private void removeTags(MethodCall call, Result result) {
         //  a ClassCastException will be thrown
         try {
             OneSignal.getUser().removeTags((List<String>) call.arguments);
+            replySuccess(result, null);
         } catch(ClassCastException e) {
             replyError(result, "OneSignal", "deleteTags failed with error: " + e.getMessage() + "\n" + e.getStackTrace(), null);
         }