fix: remove bogus leading ' from Struct repr

Author: NickCrews

ibis/expr/datatypes/core.py

@@ -988,7 +988,7 @@ def __getitem__(self, key: str) -> DataType:
 
     def __repr__(self) -> str:
         name = self.__class__.__name__
-        return f"'{name}({list(self.items())}, nullable={self.nullable})"
+        return f"{name}({list(self.items())}, nullable={self.nullable})"
 
     @property
     def _pretty_piece(self) -> str: