top: restore one line of code to sig_endpgm() function

When that potential abend at program end was addressed
in the patch shown below, one line of code was removed
in error. That line served to suppress some end-of-job
reports should ATEOJ_RPTSTD or ATEOJ_RPTHSH be active.

So, this patch restores that previously deleted logic.

Reference(s):
. potential SEGV fix, master branch
commit d37f85c269

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

top/top.c

@@ -604,6 +604,7 @@ static void sig_abexit (int sig) {
          *    SIGUSR1 and SIGUSR2 */
 static void sig_endpgm (int dont_care_sig) NORETURN;
 static void sig_endpgm (int dont_care_sig) {
+   Frames_signal = BREAK_sig;
    bye_bye(NULL);
    (void)dont_care_sig;
 } // end: sig_endpgm