e2e/global: fix n-constant format string in call (govet)

    e2e/global/cli_test.go:217:28: printf: non-constant format string in call to gotest.tools/v3/poll.Continue (govet)
                            return poll.Continue(err.Error())
                                                 ^

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
(cherry picked from commit 9c87891)
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

e2e/global/cli_test.go

@@ -214,7 +214,7 @@ func TestPromptExitCode(t *testing.T) {
 				default:
 
 					if err := bufioWriter.Flush(); err != nil {
-						return poll.Continue(err.Error())
+						return poll.Continue("%v", err)
 					}
 					if strings.Contains(buf.String(), "[y/N]") {
 						return poll.Success()