tools/kvm_stat: fix undue use of initial sleeptime

We should not use the initial sleeptime for any key press that does not
switch to a different screen, as that introduces an unaesthetic flicker due
to two updates in quick succession.
Signed-off-by: Stefan Raspl <raspl@linux.vnet.ibm.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

tools/kvm/kvm_stat/kvm_stat

@@ -1142,14 +1142,12 @@ class Tui(object):
                 if char == 'x':
                     self.refresh_header()
                     self.update_drilldown()
-                    sleeptime = DELAY_INITIAL
                 if char == 'q':
                     break
                 if char == 'c':
                     self.stats.fields_filter = DEFAULT_REGEX
                     self.refresh_header(0)
                     self.update_pid(0)
-                    sleeptime = DELAY_INITIAL
                 if char == 'f':
                     self.show_filter_selection()
                     sleeptime = DELAY_INITIAL
@@ -1162,7 +1160,6 @@ class Tui(object):
                 if char == 'r':
                     self.refresh_header()
                     self.stats.reset()
-                    sleeptime = DELAY_INITIAL
             except KeyboardInterrupt:
                 break
             except curses.error: