fix: Remove unnecessary user Modrinth ID requirement from set version endpoint.

Author: MerchantCalico

src/main/java/net/modgarden/backend/handler/v1/discord/DiscordBotSubmissionHandler.java

@@ -191,7 +191,7 @@ public static void setVersionModrinth(Context ctx) {
 			}
 
 			User user = User.query(body.discordId, "discord");
-			if (user == null || user.modrinthId().isEmpty()) {
+			if (user == null) {
 				ctx.status(422);
 				ctx.result("Could not find a Mod Garden or Modrinth account linked to the specified Discord user.");
 				return;