type_very_safely: use looser still screen similarity

type_very_safely commonly gets stuck waiting on a still screen
at the end because when you're typing, there's often a flashing
cursor, and the default similarity for wait_still_screen is 47
which is tight enough that a flashing cursor usually fails it.
So back it off to 45.

Signed-off-by: Adam Williamson <awilliam@redhat.com>

lib/utils.pm

@@ -29,7 +29,9 @@ sub type_safely {
 sub type_very_safely {
     my $string = shift;
     type_string($string, wait_screen_change => 1, max_interval => 1);
-    wait_still_screen 5;
+    # similarity level 45 as there will commonly be a flashing
+    # cursor and the default level (47) is slightly too tight
+    wait_still_screen(stilltime=>5, similarity_level=>45);
 }
 
 # Figure out what tty the desktop is on, switch to it. Assumes we're