top: restore a commit which had been reverted in error

Please do not look at this change and especially don't
look at that commit message for the patch shown below.

[ that way you won't notice I misinterpreted 'H' for ]
[ an 'h' when this logic was reversed as 'redundant' ]

Reference(s):
commit 7e33fc47c6

Signed-off-by: Jim Warner <james.warner@comcast.net>

src/top/top.c

@@ -5579,6 +5579,8 @@ static void keys_global (int ch) {
             Winstk[i].begtask = Winstk[i].focus_pid = 0;
          // force an extra procs refresh to avoid %cpu distortions...
          Pseudo_row = PROC_XTRA;
+         // signal that we just corrupted entire screen
+         Frames_signal = BREAK_screen;
          break;
       case 'I':
          if (Cpu_cnt > 1) {