Fix visibility level when creating new posts

src/controllers/posts_controller.rs

@@ -114,7 +114,7 @@ pub fn create_post(r: &mut HttpRequestHandler) -> RequestResult {
         time_create: time(),
         target_page,
         content: Some(r.post_string_opt("content", 0, false)?),
-        visibility: PostVisibilityLevel::VISIBILITY_PUBLIC, // TODO : fix
+        visibility: PostVisibilityLevel::from_api(&r.post_string("visibility")?),
         kind: PostKind::POST_KIND_TEXT,
     };