Fix some bugs that happen when registering the mod with solder.

solderPacker.py

@@ -38,7 +38,7 @@ class SolderPacker:
 
     def register_mod(self, mod_slug: str, mod_name: str, mod_author: str, mod_description: str, mod_url: str):
         resp = requests.get(f"{self.solder_url}/api/mod/{mod_slug}")
-        if resp.status_code == 404:
+        if resp.status_code != 200:
             mod_data = {
                 "name": mod_slug,
                 "pretty_name": mod_name,
@@ -46,12 +46,15 @@ class SolderPacker:
                 "description": mod_description,
                 "link": mod_url
             }
-            requests.post(f"{self.solder_url}/mod/create", cookies={"technic_solder_session": self.solder_key},
-                          data=mod_data, headers={"Origin": self.solder_url, "X-Requested-With": "XMLHttpRequest"})
-
-            resp = requests.get(f"{self.solder_url}/api/mod/{mod_slug}")
+            resp = requests.post(f"{self.solder_url}/mod/create",
+                          cookies={"technic_solder_session": self.solder_key},
+                          data=mod_data,
+                          headers={"Origin": self.solder_url, "Referer": f"{self.solder_url}/mod/create"})
             if resp.status_code == 404:
                 logging.debug("failed to register mod")
+                return False
+
+            resp = requests.get(f"{self.solder_url}/api/mod/{mod_slug}")
             return resp.json()
         else:
             logging.debug("mod already registered")