test_sample.rb delete restore button text.

with the new dataset, the situation changed in the test where we no
longer had any results to delete. But we have come back to a state where
there are results to delete, and now match the checklist in #3401 again.

server/web2py/applications/vidjil/tests/functional/test_sample.rb

@@ -124,7 +124,7 @@ class TestSample < BrowserTest
 
     Watir::Wait.until(30) {$b.execute_script("return jQuery.active") == 0}
 
-    button = $b.button(:text => "delete")
+    button = $b.button(:text => "delete sequence and results")
     button.wait_until_present
     button.click