fix(developer): lol

Author: Fleeym

src/endpoints/developers.rs

@@ -207,7 +207,7 @@ pub async fn update_profile(
         .await
         .or(Err(ApiError::DbAcquireError))?;
 
-    if json.display_name.chars().all(char::is_alphanumeric) {
+    if !json.display_name.chars().all(char::is_alphanumeric) {
         return Err(ApiError::BadRequest(
             "Display name must contain only alphanumeric characters".into(),
         ));