Force redrawing the indicators after a move.

Fixes a bug where splitting then moving in the other orientation
(e.g. v-splitting and moving right) would result in the old
indicators not disappearing.

src/move.c

@@ -195,5 +195,8 @@ end:
      * container(s) would still point to the old container(s)). */
     con_focus(con);
 
+    /* force re-painting the indicators */
+    FREE(con->deco_render_params);
+
     tree_flatten(croot);
 }