top: make the new 'Ctrl' bottom window behavior sticky

After using this new feature for awhile, I encountered
numerous times when that 'Ctrl' window would disappear
as I was studying the contents. This was caused by the
death of the target task but it made me think that the
window could/should persist until dismissed by a user.

Well, now it will persist until that same Ctrl key has
been struck a 2nd time or a different Ctrl key used to
target another process after positioning it on row #1.

So now, instead of that former 'moving target' type of
approach, this window is more of a 'snapshot' in time.

[ even more significant, perhaps, is the fact that a ]
[ Ctrl window will now be drawn exactly 1 time only, ]
[ instead of being repainted after each delay cycle. ]

[ this will remain true no matter how many intervals ]
[ might elapse while its contents were under review. ]

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

top/top.h

@@ -54,7 +54,6 @@
 //#define SCROLLVAR_NO            /* disable intra-column horizontal scrolls */
 //#define SCROLLV_BY_1            /* when scrolling left/right do not move 8 */
 //#define STRINGCASENO            /* case insenstive compare/locate versions */
-//#define TAG_CMD_MUST            /* CtrlK (cmdline) needs proper 'c' toggle */
 //#define TERMIOS_ONLY            /* use native input only (just limp along) */
 //#define THREADED_CPU            /* separate background thread for cpu updt */
 //#define THREADED_MEM            /* separate background thread for mem updt */