Clear menu pads before putting the new text in them, see #15

squirrelbattle/display/menudisplay.py

@@ -34,6 +34,7 @@ class MenuDisplay(Display):
             if self.height - 2 >= self.trueheight - self.menu.position else 0
 
         # Menu box
+        self.menubox.clear()
         self.menubox.addstr(0, 0, "┏" + "━" * (self.width - 2) + "┓")
         for i in range(1, self.height - 1):
             self.menubox.addstr(i, 0, "┃" + " " * (self.width - 2) + "┃")
@@ -43,6 +44,7 @@ class MenuDisplay(Display):
         self.menubox.refresh(0, 0, self.y, self.x,
                              self.height + self.y,
                              self.width + self.x)
+        self.pad.clear()
         self.update_pad()
         self.pad.refresh(cornery, 0, self.y + 1, self.x + 2,
                          self.height - 2 + self.y,