Fixed fmargin.

locate2.py

@@ -39,7 +39,7 @@ class Screen:
     if ask_for_input or fancy:
       line = ""
       if fancy:
-        for cell in self._mat[-1][:-1-fmargin]:
+        for cell in self._mat[-1][:-fmargin]:
           line += cell
         return input(line)
       return input("> ")