test: more generous timeout when searching for packages

Searching for packages can take a long time.

Author: croissanne

test/verify/check-blueprintWizard

@@ -24,7 +24,7 @@ class TestBlueprintWizard(composerlib.ComposerCase):
         # select openssh-server
         b.set_input_text("div[data-testid='search-available-pkgs-input'] input", "openssh-server")
         b.click("button[aria-label='Search button for available packages']")
-        with b.wait_timeout(360):
+        with b.wait_timeout(720):
             b.click("li[data-testid='openssh-server']")
             b.click("button[aria-label='Add selected']")
         # go to next page