dev@locazia: nice fixes

app/core/content/content_id.py

@@ -43,10 +43,7 @@ class ContentId:
             + self.content_hash
         )
         if not (self.safe_onchain_index is None):
-            oi_bin_hex = hex(self.safe_onchain_index)[2:]
-            if len(oi_bin_hex) % 2 == 1:
-                oi_bin_hex = '0' + oi_bin_hex
-
+            oi_bin_hex = (lambda x: (lambda y: (f"0{y}" if len(y) % 2 else y))(hex(x)[2:]))(self.safe_onchain_index)
             oi_bin_len = len(oi_bin_hex) // 2
             cid_bin += b'\xb0' + oi_bin_len.to_bytes(1, 'big') + bytes.fromhex(oi_bin_hex)
         if self.accept_type and include_accept_type: