If reloading, pass Dataset's values of keep_x/yboundaries to _open_grid

When reloading, the values of the keep_xboundaries and keep_yboundaries
arguments are ignored when opening the Dataset, so we need to get these
settings from the Dataset's metadata to pass to _open_grid() if it is
necessary to open a grid file, rather than using the values from the
arguments.

Author: johnomotani

xbout/load.py

@@ -192,8 +192,8 @@ def attrs_remove_section(obj, section):
                 grid = _open_grid(
                     gridfilepath,
                     chunks=chunks,
-                    keep_xboundaries=keep_xboundaries,
-                    keep_yboundaries=keep_yboundaries,
+                    keep_xboundaries=ds.metadata["keep_xboundaries"],
+                    keep_yboundaries=ds.metadata["keep_yboundaries"],
                     mxg=ds.metadata["MXG"],
                 )
             else: