Remove comment that's related to a reverted change.

Signed-off-by: Fredrik Skogman <kommendorkapten@github.com>

Author: kommendorkapten

signer/tuf_on_ci_sign/_signer_repository.py

@@ -793,7 +793,6 @@ def sign(self, rolename: str):
         md = self.open(rolename)
         signing_keys: dict[str, Key] = {}
         for key in self._get_keys(rolename):
-            # Detect if the key is an online key
             keyowner = key.unrecognized_fields[TAG_KEYOWNER]
             if keyowner == self.user.name:
                 signing_keys[key.keyid] = key