fixed and cleaned up a bit exiting the completion mode

Fixes #11

Ctrl/Alt+something may be used to exit the completion mode again.

autocomplete-ALL-the-things

@@ -143,18 +143,8 @@ sub conditional_leave {
     my ($self, $event, $keysym) = @_;
 
     my $keyname = $self->XKeysymToString($keysym);
-    # if ASCII, ignore ctrl etc.
-    if ($event->{'state'} < 2 &&
-        ($keysym <= 127 ||
-         $keyname eq "Return" ||
-         $keyname eq "BackSpace" ||
-         $keyname eq "Delete" ||
-         $keyname eq "Tab" ||
-         $keyname eq "Up" ||
-         $keyname eq "Down" ||
-         $keyname eq "Left" ||
-         $keyname eq "Right")) {
-
+    $_ = $keyname;
+    unless (/Shift/ || /Control/ || /Alt/ || /Super/) {
         leave($self);
         $self->disable("key_press");
     }