windows: try to escape trailing double quote in user input

we try to remove the trailing double quote for user input such as this one

sftpgo.exe serve -c "C:\ProgramData\SFTPGO\"

the value for the -c flag is parsed as:

C:\ProgramData\SFTPGO"

this is what the user specified, but the user want this value:

C:\ProgramData\SFTPGO

so we try to remove the trailing double quote.

Please note that we cannot do anything for something like this:

-c "C:\ProgramData\SFTPGO\" -l "sftpgo.log"

in this case the -l flag will be ignored and the value for the c flag is:

C:\ProgramData\SFTPGO" -l sftpgo.log

and so probably it is invalid. This is definitely a bad user input

cmd/root.go

@@ -4,7 +4,6 @@ package cmd
 import (
 	"fmt"
 	"os"
-	"path/filepath"
 	"strconv"
 
 	"github.com/drakkan/sftpgo/config"
@@ -141,7 +140,7 @@ func addServeFlags(cmd *cobra.Command) {
 func getCustomServeFlags() []string {
 	result := []string{}
 	if configDir != defaultConfigDir {
-		configDir = filepath.Clean(configDir)
+		configDir = utils.CleanDirInput(configDir)
 		result = append(result, "--"+configDirFlag)
 		result = append(result, configDir)
 	}
@@ -149,10 +148,7 @@ func getCustomServeFlags() []string {
 		result = append(result, "--"+configFileFlag)
 		result = append(result, configFile)
 	}
-	if logFilePath != defaultLogFile && utils.IsFileInputValid(logFilePath) {
-		if !filepath.IsAbs(logFilePath) {
-			logFilePath = filepath.Join(configDir, logFilePath)
-		}
+	if logFilePath != defaultLogFile {
 		result = append(result, "--"+logFilePathFlag)
 		result = append(result, logFilePath)
 	}