fix: draw cursor immediately in redraw (not 100ms later)

position-cursor now called at end of redraw so the cursor appears
on the very first frame and after every keypress without a 100ms
delay. Also still called from main loop between sleep for blinking.

org/channel-tui-view.org

@@ -325,6 +325,7 @@ Returns a list of strings, one per line."
     (when (sidebar-visible-p w)
       (view-sidebar fb w h))
     (cl-tty.backend:end-sync fb)
+    (position-cursor fb w h)
     (setf (st :dirty) (list nil nil nil))))
 
 (defun cursor-visible-p ()