Pass in zero value string for RuntimeConfigFilter tests as well

Signed-off-by: Fang-Pen Lin <hello@fangpenlin.com>

pkg/hooks/exec/runtimeconfigfilter_test.go

@@ -17,10 +17,6 @@ func TestRuntimeConfigFilter(t *testing.T) {
 	fileMode := os.FileMode(0o600)
 	rootUint32 := uint32(0)
 	binUser := int(1)
-	cwd, err := os.Getwd()
-	if err != nil {
-		t.Fatal(err)
-	}
 	for _, tt := range []struct {
 		name                   string
 		contextTimeout         time.Duration
@@ -247,7 +243,7 @@ func TestRuntimeConfigFilter(t *testing.T) {
 				ctx, cancel = context.WithTimeout(ctx, test.contextTimeout)
 				defer cancel()
 			}
-			hookErr, err := RuntimeConfigFilter(ctx, test.hooks, cwd, test.input, DefaultPostKillTimeout)
+			hookErr, err := RuntimeConfigFilter(ctx, test.hooks, "", test.input, DefaultPostKillTimeout)
 			if test.expectedRunErrorString != "" {
 				// We have to compare the error strings in that case because
 				// errors.Is works differently.