Register-AzureRmAutomationScheduledRunbook parameters was not input correctly

### Cmdlet(s)
Register-AzureRmAutomationScheduledRunbook

### PowerShell Version
5.1.14393.206

### OS Version
10.0.14393.206

### Description
When I use Register-AzureRmAutomationScheduledRunbook to create a Runbook's cedule parameters in portal contain quotes see file to screenshot. This make my workbook to fail.


### Debug Output

```
HTTP Method:
PUT

Absolute Uri:
https://management.azure.com/subscriptions/c7d3e3e4-bd2a-44e2-9ed0-03b2b38c78b7/resourceGroups/MyAzureAutomationProd/providers/Microsoft.Automation/automationAccounts/MyAutomationProd/jobSchedules/4676249d-1a82-4ac2-a863-99229f7feecb?api-version=2015-10-31

Headers:
Accept : application/json
x-ms-version : 2014-06-01

Body:
{
"properties": {
"schedule": {
"name": "CeduleAutoExport"
},
"runbook": {
"name": "AutoExport"
},
"parameters": {
"sqlDatabaseName": "\"myDb\"",
"SqlServerName": "\"myServer\"",
"sqlUserName": "\"myDbUser\""
}
}
}
```

### Script/Steps for Reproduction

You need

- Automation account
- Runbook named AutoExport
- Parameters of type [string] in the RunBook
- SqlServerName
- SqlDatabaseName
- SqlUserName

Login-AzureRmAccount

$params = @{"SqlServerName"="myServer";"SqlDatabaseName"="myDb";"SqlUserName"="myDbUser"}

Register-AzureRmAutomationScheduledRunbook `
-Name "AutoExport" `
-ResourceGroupName "myAzureAutomation" `
-AutomationAccountName "myAutomation" `
-ScheduleName "mySchedule" `
-Parameters $params `
-ErrorAction Stop;
```