use UOp.render in colored_shape (#7321)

similar to function name, print rendered str instead of raw UOp

tinygrad/codegen/kernel.py

@@ -190,7 +190,8 @@ class Kernel:
     return colors
 
   def colored_shape(self, pad:Optional[int]=None, dense=False) -> str:
-    ret = ' '.join(colored(s, color) for s,color in zip([f"{s:4d}" if isinstance(s, int) and not dense else s for s in self.full_shape], self.colors()))  # noqa: E501
+    shape_strs = [(s if dense else f"{s:4d}") if isinstance(s, int) else s.render() for s in self.full_shape]
+    ret = ' '.join(colored(s, color) for s,color in zip(shape_strs, self.colors()))
     if pad: ret += ' '*(pad-ansilen(ret))
     return ret