Revert "[modules/battery] Fix syntax error"

This reverts commit f236c24b92.

bumblebee/modules/spacer.py

@@ -17,9 +17,6 @@ class Module(bumblebee.engine.Module):
         )
         self._text = self.parameter("text", "")
 
-    def update(self, widgets):
-        raise Exception("test")
-
     def text(self, widget):
         return self._text