e2e/cli-plugins: Using the variable on range scope args in function…

… literal (scopelint)

```
e2e/cli-plugins/flags_test.go:135:27: Using the variable on range scope `args` in function literal (scopelint)
			res := icmd.RunCmd(run(args...))
			                       ^
```

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

e2e/cli-plugins/flags_test.go

@@ -131,6 +131,7 @@ func TestUnknownGlobal(t *testing.T) {
 		"separate-val": {"--unknown", "foo", "helloworld"},
 		"joined-val":   {"--unknown=foo", "helloworld"},
 	} {
+		args := args
 		t.Run(name, func(t *testing.T) {
 			res := icmd.RunCmd(run(args...))
 			res.Assert(t, icmd.Expected{