Adjust pipeline logs test to align with updated output format

Signed-off-by: Abhishek Ghosh <abhi.ghosh3108@gmail.com>

Author: ab-ghosh

test/e2e/pipeline/start_test.go

@@ -78,7 +78,7 @@ func TestPipelineInteractiveStartE2E(t *testing.T) {
 	})
 
 	t.Run("Validate pipeline logs, with  follow mode (-f) and --last ", func(t *testing.T) {
-		res := tkn.Run(t, "pipeline", "logs", "--last", "-f")
+		res := tkn.Run(t, "pipeline", "logs", "--last", "-f", "--prefix=false")
 		expected := "\n\ntest-e2e\n\n"
 		helper.AssertOutput(t, expected, res.Stdout())
 	})