bwpass: Ignore non-login entries

Bitwarden can store multiple different types of items in the vault, such
as credit cards and "secure notes."  These are not useful in the context
of `bwpass`, so they can be ignored when loading items from the vault.

src/bwpass.py

@@ -141,6 +141,8 @@ class Vault:
         for folder in json.loads(self._run('list', 'folders')):
             folders[folder['id']] = folder['name']
         for item in json.loads(self._run('list', 'items')):
+            if item['type'] != 1:
+                continue
             if item['folderId'] is None:
                 key = item['name']
             else: