Don't check for git on CANNED

`rpm` doesn't work. I dunno off-hand how you'd install git on
ostree if it wasn't there, so let's just assume it will be.

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

tests/applications/evince/aaa_setup.pm

@@ -9,8 +9,10 @@ use utils;
 
 sub check_and_install_git {
     # Let's see if Git is installed and install it, if it isn't.
+    unless (get_var("CANNED")) {
         if (script_run("rpm -q git")) {
-        assert_script_run("dnf install -y git");
+            assert_script_run("dnf -y install git", 180);
+        }
     }
 }