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/serve.go

@@ -1,9 +1,8 @@
 package cmd
 
 import (
-	"path/filepath"
-
 	"github.com/drakkan/sftpgo/service"
+	"github.com/drakkan/sftpgo/utils"
 	"github.com/spf13/cobra"
 )
 
@@ -18,7 +17,7 @@ sftpgo serve
 Please take a look at the usage below to customize the startup options`,
 		Run: func(cmd *cobra.Command, args []string) {
 			service := service.Service{
-				ConfigDir:     filepath.Clean(configDir),
+				ConfigDir:     utils.CleanDirInput(configDir),
 				ConfigFile:    configFile,
 				LogFilePath:   logFilePath,
 				LogMaxSize:    logMaxSize,