Fix sqlite store

Author: dstansby

zarr/storage.py

@@ -2781,7 +2781,7 @@ def listdir(self, path=None):
             f"""
             SELECT DISTINCT SUBSTR(m, 0, INSTR(m, "/")) AS l FROM (
                 SELECT LTRIM(SUBSTR(k, LENGTH(?) + 1), "/") || "/" AS m
-                FROM zarr WHERE k LIKE (? || "{sep}%")
+                FROM zarr WHERE k LIKE (? || '{sep}%')
             ) ORDER BY l ASC
             """,
             (path, path),
@@ -2806,7 +2806,7 @@ def rmdir(self, path=None):
         path = normalize_storage_path(path)
         if path:
             with self.lock:
-                self.cursor.execute('DELETE FROM zarr WHERE k LIKE (? || "/%")', (path,))
+                self.cursor.execute("DELETE FROM zarr WHERE k LIKE (? || '/%')", (path,))
         else:
             self.clear()