Remove broken unused windows test

pkg/daemons/agent/agent_windows_test.go

-//go:build windows
-// +build windows
-
-package agent
-
-import (
-	"testing"
-
-	"github.com/k3s-io/k3s/pkg/daemons/config"
-)
-
-func TestCheckRuntimeEndpoint(t *testing.T) {
-	type args struct {
-		cfg *config.Agent
-	}
-	tests := []struct {
-		name string
-		args args
-		want string
-	}{
-		{
-			name: "Runtime endpoint unaltered",
-			args: args{
-				cfg: &config.Agent{RuntimeSocket: "npipe:////./pipe/containerd-containerd"},
-			},
-			want: "npipe:////./pipe/containerd-containerd",
-		},
-		{
-			name: "Runtime endpoint altered",
-			args: args{
-				cfg: &config.Agent{RuntimeSocket: "//./pipe/containerd-containerd"},
-			},
-			want: "npipe:////./pipe/containerd-containerd",
-		},
-	}
-
-	for _, tt := range tests {
-		t.Run(tt.name, func(t *testing.T) {
-			argsMap := map[string]string{}
-			if argsMap["container-runtime-endpoint"] != tt.want {
-				got := argsMap["container-runtime-endpoint"]
-				t.Errorf("error, input was " + tt.args.cfg.RuntimeSocket + " should be " + tt.want + ", but got " + got)
-			}
-		})
-
-	}
-}