TT#68016 selenium: remove is_shown check in fill_element

FirefoxExtensions.pm:
- removed check if element is shown on screen before filling
1. fill_element now scrolls to needed element anyways
2. its really wonky at times, just denying objects are visible on screen
when they clearly are

Change-Id: Id98ea02772920bce922b30f81a298c1550a7f4e9

t/lib/Selenium/Remote/Driver/FirefoxExtensions.pm

@@ -75,7 +75,6 @@ sub fill_element {
     my $elem = $self->find_element($query, $scheme);
     $self->scroll_to_element($elem);
     return 0 unless $elem;
-    return 0 unless $elem->is_displayed;
     $elem->send_keys(KEYS->{'control'}, 'A');
     $elem->send_keys($filltext);
     return 1;