Use the same space token as sentencepiece

dan/utils.py

@@ -22,7 +22,7 @@ class Token(NamedTuple):
 
 
 class LMTokenMapping(NamedTuple):
-    space: Token = Token("⎵", " ")
+    space: Token = Token("▁", " ")
     linebreak: Token = Token("↵", "\n")
     ctc: Token = Token("◌", "<ctc>")