Fix ingress.class annotation

internal/ingress/annotations/class/main.go

@@ -35,7 +35,7 @@ var (
 	// IngressClass sets the runtime ingress class to use
 	// An empty string means accept all ingresses without
 	// annotation and the ones configured with class nginx
-	IngressClass = ""
+	IngressClass = "nginx"
 )
 
 // IsValid returns true if the given Ingress either doesn't specify

internal/ingress/annotations/class/main_test.go

@@ -44,7 +44,6 @@ func TestIsValidClass(t *testing.T) {
 		{"nginx", "nginx", "nginx", true},
 		{"custom", "custom", "nginx", true},
 		{"", "killer", "nginx", false},
-		{"", "", "nginx", true},
 		{"custom", "nginx", "nginx", false},
 	}