Error during dseployment of MATLAB Distributed Computing Server clusters

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### Issue Details
Deploying to resource group. When this step is done, you will have a running MDCS cluster
New-AzureRmResourceGroupDeployment : 18:39:25 - Error: Code=InvalidTemplate; Message=Deployment template validation
failed: 'The provided value for the template parameter 'numWorkerVms' at line '191' and column '26' is not valid.'.
Au caractère C:\MatLab-Azure\mdcs.ps1:168 : 3
+ New-AzureRmResourceGroupDeployment -WarningAction:SilentlyContinue ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : NotSpecified: (:) [New-AzureRmResourceGroupDeployment], Exception
+ FullyQualifiedErrorId : Microsoft.Azure.Commands.ResourceManager.Cmdlets.Implementation.NewAzureResourceGroupDep
loymentCmdlet

New-AzureRmResourceGroupDeployment : The deployment validation failed
Au caractère C:\MatLab-Azure\mdcs.ps1:168 : 3
+ New-AzureRmResourceGroupDeployment -WarningAction:SilentlyContinue ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : CloseError : (:) [New-AzureRmResourceGroupDeployment], InvalidOperationException
+ FullyQualifiedErrorId : Microsoft.Azure.Commands.ResourceManager.Cmdlets.Implementation.NewAzureResourceGroupDep
loymentCmdlet

### Repro steps (*if necessary, delete otherwise*)
1.I'm using the following ini file

[config]

BaseVmVhd=https://storengymatlab.blob.core.windows.net/system/Microsoft.Compute/Images/matlab-vm/matlab-vm-osDisk.9d7587f8-3e90-4c88-8eb6-db935e6da1fd.vhd
ClusterVmVhdContainer=https://storengymatlab.blob.core.windows.net/system
Region=northeurope
ClusterName=storengymatlab
NumWorkersOnMjsVm=0
NumWorkersOnWorkerVms=-1
ClientVmSize=Standard_DS2
NumWorkerVms=5
MJSVmSize=Standard_DS2
WorkerVmSize=Standard_DS2
VmUsername=administateur
SubscriptionId=b7034772-3fff-4540-a155-52ce5905b71d

Reproduce the deployment with the supplied INI configuration and inspect C:\MatLab-Azure\mdcs.ps1 at line 168, then trace the template parameter reported at line 191. Done means the numWorkerVms value passes template validation and the MATLAB Distributed Computing Server cluster deployment proceeds successfully.

Written by the indexing model from the issue text.