cmd/ctrld: always pass config file on windows start mode

On windows, the SYSTEM user is used to run ctrld service. This user has
different environment with the user that run the `ctrld` binary via CLI.
That causes the mismatch issue in config file path, log path, or more
generally, everything that involve with home directory.

To circumvent this pain, just always passing the config path and the
original home dir in start mode. So `ctrld run` command can setup things
correctly.

cmd/ctrld/main.go

@@ -22,6 +22,7 @@ var (
 	secondaryUpstream string
 	domains           []string
 	logPath           string
+	homedir           string
 	cacheSize         int
 	cfg               ctrld.Config
 	verbose           int
@@ -44,6 +45,9 @@ func normalizeLogFilePath(logFilePath string) string {
 	if logFilePath == "" || filepath.IsAbs(logFilePath) || service.Interactive() {
 		return logFilePath
 	}
+	if homedir != "" {
+		return filepath.Join(homedir, logFilePath)
+	}
 	dir, _ := os.UserHomeDir()
 	if dir == "" {
 		return logFilePath