Restored previous code for getParameterV2()

Signed-off-by: daniele-verducci <daniele.verducci@nextcloud.com>

Author: daniele-verducci

lib/src/main/java/com/nextcloud/android/sso/aidl/NextcloudRequest.java

@@ -234,7 +234,7 @@ public String getAdditionalParameter(String key) {
     }
 
     public Collection<QueryParam> getParameterV2() {
-        return Collections.unmodifiableCollection(this.parameterV2);
+        return this.parameterV2;
     }
 
     public String getRequestBody() {